A systematic review and meta-analysis of 24-h urinary output of children and adolescents: impact on the assessment of iodine status using urinary biomarkers
Purpose Urinary iodine concentration (UIC (μg/ml) from spot urine samples collected from school-aged children is used to determine the iodine status of populations. Some studies further extrapolate UIC to represent daily iodine intake, based on the assumption that children pass approximately 1 L uri...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Beckford, Kelsey [verfasserIn] Grimes, Carley A. [verfasserIn] Margerison, Claire [verfasserIn] Riddell, Lynn J. [verfasserIn] Skeaff, Sheila A. [verfasserIn] West, Madeline L. [verfasserIn] Nowson, Caryl A. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2019 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Zeitschrift für Ernährungswissenschaft - Darmstadt : Steinkopff, 1960, 59(2019), 7 vom: 29. Nov., Seite 3113-3131 |
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| Übergeordnetes Werk: |
volume:59 ; year:2019 ; number:7 ; day:29 ; month:11 ; pages:3113-3131 |
| Links: |
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| DOI / URN: |
10.1007/s00394-019-02151-w |
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SPR041018702 |
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| 520 | |a Purpose Urinary iodine concentration (UIC (μg/ml) from spot urine samples collected from school-aged children is used to determine the iodine status of populations. Some studies further extrapolate UIC to represent daily iodine intake, based on the assumption that children pass approximately 1 L urine over 24-h, but this has never been assessed in population studies. Therefore, the present review aimed to collate and produce an estimate of the average 24-h urine volume of children and adolescents (> 1 year and < 19 years) from published studies. Methods EBSCOHOST and EMBASE databases were searched to identify studies which reported the mean 24-h urinary volume of healthy children (> 1 year and < 19 years). The overall mean (95% CI) estimate of 24-h urine volume was determined using a random effects model, broken down by age group. Results Of the 44 studies identified, a meta-analysis of 27 studies, with at least one criterion for assessing the completeness of urine collections, indicated that the mean urine volume of 2–19 year olds was 773 (654, 893) (95% CI) mL/24-h. When broken down by age group, mean (95% CI) 24-h urine volume was 531 mL/day (454, 607) for 2–5 year olds, 771 mL/day (734, 808) for 6–12 year olds, and 1067 mL/day (855, 1279) for 13–19 year olds. Conclusions These results demonstrate that the average urine volume of children aged 2–12 years is less than 1 L, therefore, misclassification of iodine intakes may occur when urine volumes fall below or above 1 L. Future studies utilizing spot urine samples to assess iodine status should consider this when extrapolating UIC to represent iodine intakes of a population. | ||
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| 700 | 1 | |a Grimes, Carley A. |e verfasserin |4 aut | |
| 700 | 1 | |a Margerison, Claire |e verfasserin |4 aut | |
| 700 | 1 | |a Riddell, Lynn J. |e verfasserin |4 aut | |
| 700 | 1 | |a Skeaff, Sheila A. |e verfasserin |4 aut | |
| 700 | 1 | |a West, Madeline L. |e verfasserin |4 aut | |
| 700 | 1 | |a Nowson, Caryl A. |e verfasserin |4 aut | |
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10.1007/s00394-019-02151-w doi (DE-627)SPR041018702 (SPR)s00394-019-02151-w-e DE-627 ger DE-627 rakwb eng 630 640 610 ASE 44.21 bkl Beckford, Kelsey verfasserin aut A systematic review and meta-analysis of 24-h urinary output of children and adolescents: impact on the assessment of iodine status using urinary biomarkers 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Purpose Urinary iodine concentration (UIC (μg/ml) from spot urine samples collected from school-aged children is used to determine the iodine status of populations. Some studies further extrapolate UIC to represent daily iodine intake, based on the assumption that children pass approximately 1 L urine over 24-h, but this has never been assessed in population studies. Therefore, the present review aimed to collate and produce an estimate of the average 24-h urine volume of children and adolescents (> 1 year and < 19 years) from published studies. Methods EBSCOHOST and EMBASE databases were searched to identify studies which reported the mean 24-h urinary volume of healthy children (> 1 year and < 19 years). The overall mean (95% CI) estimate of 24-h urine volume was determined using a random effects model, broken down by age group. Results Of the 44 studies identified, a meta-analysis of 27 studies, with at least one criterion for assessing the completeness of urine collections, indicated that the mean urine volume of 2–19 year olds was 773 (654, 893) (95% CI) mL/24-h. When broken down by age group, mean (95% CI) 24-h urine volume was 531 mL/day (454, 607) for 2–5 year olds, 771 mL/day (734, 808) for 6–12 year olds, and 1067 mL/day (855, 1279) for 13–19 year olds. Conclusions These results demonstrate that the average urine volume of children aged 2–12 years is less than 1 L, therefore, misclassification of iodine intakes may occur when urine volumes fall below or above 1 L. Future studies utilizing spot urine samples to assess iodine status should consider this when extrapolating UIC to represent iodine intakes of a population. Iodine (dpeaa)DE-He213 Urine (dpeaa)DE-He213 Urine volume (dpeaa)DE-He213 Children (dpeaa)DE-He213 Adolescents (dpeaa)DE-He213 Nutrition (dpeaa)DE-He213 Assessment (dpeaa)DE-He213 Grimes, Carley A. verfasserin aut Margerison, Claire verfasserin aut Riddell, Lynn J. verfasserin aut Skeaff, Sheila A. verfasserin aut West, Madeline L. verfasserin aut Nowson, Caryl A. verfasserin aut Enthalten in Zeitschrift für Ernährungswissenschaft Darmstadt : Steinkopff, 1960 59(2019), 7 vom: 29. Nov., Seite 3113-3131 (DE-627)461907356 (DE-600)2164295-3 1435-1293 nnns volume:59 year:2019 number:7 day:29 month:11 pages:3113-3131 https://dx.doi.org/10.1007/s00394-019-02151-w kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_647 GBV_ILN_702 44.21 ASE AR 59 2019 7 29 11 3113-3131 |
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10.1007/s00394-019-02151-w doi (DE-627)SPR041018702 (SPR)s00394-019-02151-w-e DE-627 ger DE-627 rakwb eng 630 640 610 ASE 44.21 bkl Beckford, Kelsey verfasserin aut A systematic review and meta-analysis of 24-h urinary output of children and adolescents: impact on the assessment of iodine status using urinary biomarkers 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Purpose Urinary iodine concentration (UIC (μg/ml) from spot urine samples collected from school-aged children is used to determine the iodine status of populations. Some studies further extrapolate UIC to represent daily iodine intake, based on the assumption that children pass approximately 1 L urine over 24-h, but this has never been assessed in population studies. Therefore, the present review aimed to collate and produce an estimate of the average 24-h urine volume of children and adolescents (> 1 year and < 19 years) from published studies. Methods EBSCOHOST and EMBASE databases were searched to identify studies which reported the mean 24-h urinary volume of healthy children (> 1 year and < 19 years). The overall mean (95% CI) estimate of 24-h urine volume was determined using a random effects model, broken down by age group. Results Of the 44 studies identified, a meta-analysis of 27 studies, with at least one criterion for assessing the completeness of urine collections, indicated that the mean urine volume of 2–19 year olds was 773 (654, 893) (95% CI) mL/24-h. When broken down by age group, mean (95% CI) 24-h urine volume was 531 mL/day (454, 607) for 2–5 year olds, 771 mL/day (734, 808) for 6–12 year olds, and 1067 mL/day (855, 1279) for 13–19 year olds. Conclusions These results demonstrate that the average urine volume of children aged 2–12 years is less than 1 L, therefore, misclassification of iodine intakes may occur when urine volumes fall below or above 1 L. Future studies utilizing spot urine samples to assess iodine status should consider this when extrapolating UIC to represent iodine intakes of a population. Iodine (dpeaa)DE-He213 Urine (dpeaa)DE-He213 Urine volume (dpeaa)DE-He213 Children (dpeaa)DE-He213 Adolescents (dpeaa)DE-He213 Nutrition (dpeaa)DE-He213 Assessment (dpeaa)DE-He213 Grimes, Carley A. verfasserin aut Margerison, Claire verfasserin aut Riddell, Lynn J. verfasserin aut Skeaff, Sheila A. verfasserin aut West, Madeline L. verfasserin aut Nowson, Caryl A. verfasserin aut Enthalten in Zeitschrift für Ernährungswissenschaft Darmstadt : Steinkopff, 1960 59(2019), 7 vom: 29. Nov., Seite 3113-3131 (DE-627)461907356 (DE-600)2164295-3 1435-1293 nnns volume:59 year:2019 number:7 day:29 month:11 pages:3113-3131 https://dx.doi.org/10.1007/s00394-019-02151-w kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_647 GBV_ILN_702 44.21 ASE AR 59 2019 7 29 11 3113-3131 |
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10.1007/s00394-019-02151-w doi (DE-627)SPR041018702 (SPR)s00394-019-02151-w-e DE-627 ger DE-627 rakwb eng 630 640 610 ASE 44.21 bkl Beckford, Kelsey verfasserin aut A systematic review and meta-analysis of 24-h urinary output of children and adolescents: impact on the assessment of iodine status using urinary biomarkers 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Purpose Urinary iodine concentration (UIC (μg/ml) from spot urine samples collected from school-aged children is used to determine the iodine status of populations. Some studies further extrapolate UIC to represent daily iodine intake, based on the assumption that children pass approximately 1 L urine over 24-h, but this has never been assessed in population studies. Therefore, the present review aimed to collate and produce an estimate of the average 24-h urine volume of children and adolescents (> 1 year and < 19 years) from published studies. Methods EBSCOHOST and EMBASE databases were searched to identify studies which reported the mean 24-h urinary volume of healthy children (> 1 year and < 19 years). The overall mean (95% CI) estimate of 24-h urine volume was determined using a random effects model, broken down by age group. Results Of the 44 studies identified, a meta-analysis of 27 studies, with at least one criterion for assessing the completeness of urine collections, indicated that the mean urine volume of 2–19 year olds was 773 (654, 893) (95% CI) mL/24-h. When broken down by age group, mean (95% CI) 24-h urine volume was 531 mL/day (454, 607) for 2–5 year olds, 771 mL/day (734, 808) for 6–12 year olds, and 1067 mL/day (855, 1279) for 13–19 year olds. Conclusions These results demonstrate that the average urine volume of children aged 2–12 years is less than 1 L, therefore, misclassification of iodine intakes may occur when urine volumes fall below or above 1 L. Future studies utilizing spot urine samples to assess iodine status should consider this when extrapolating UIC to represent iodine intakes of a population. Iodine (dpeaa)DE-He213 Urine (dpeaa)DE-He213 Urine volume (dpeaa)DE-He213 Children (dpeaa)DE-He213 Adolescents (dpeaa)DE-He213 Nutrition (dpeaa)DE-He213 Assessment (dpeaa)DE-He213 Grimes, Carley A. verfasserin aut Margerison, Claire verfasserin aut Riddell, Lynn J. verfasserin aut Skeaff, Sheila A. verfasserin aut West, Madeline L. verfasserin aut Nowson, Caryl A. verfasserin aut Enthalten in Zeitschrift für Ernährungswissenschaft Darmstadt : Steinkopff, 1960 59(2019), 7 vom: 29. Nov., Seite 3113-3131 (DE-627)461907356 (DE-600)2164295-3 1435-1293 nnns volume:59 year:2019 number:7 day:29 month:11 pages:3113-3131 https://dx.doi.org/10.1007/s00394-019-02151-w kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_647 GBV_ILN_702 44.21 ASE AR 59 2019 7 29 11 3113-3131 |
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10.1007/s00394-019-02151-w doi (DE-627)SPR041018702 (SPR)s00394-019-02151-w-e DE-627 ger DE-627 rakwb eng 630 640 610 ASE 44.21 bkl Beckford, Kelsey verfasserin aut A systematic review and meta-analysis of 24-h urinary output of children and adolescents: impact on the assessment of iodine status using urinary biomarkers 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Purpose Urinary iodine concentration (UIC (μg/ml) from spot urine samples collected from school-aged children is used to determine the iodine status of populations. Some studies further extrapolate UIC to represent daily iodine intake, based on the assumption that children pass approximately 1 L urine over 24-h, but this has never been assessed in population studies. Therefore, the present review aimed to collate and produce an estimate of the average 24-h urine volume of children and adolescents (> 1 year and < 19 years) from published studies. Methods EBSCOHOST and EMBASE databases were searched to identify studies which reported the mean 24-h urinary volume of healthy children (> 1 year and < 19 years). The overall mean (95% CI) estimate of 24-h urine volume was determined using a random effects model, broken down by age group. Results Of the 44 studies identified, a meta-analysis of 27 studies, with at least one criterion for assessing the completeness of urine collections, indicated that the mean urine volume of 2–19 year olds was 773 (654, 893) (95% CI) mL/24-h. When broken down by age group, mean (95% CI) 24-h urine volume was 531 mL/day (454, 607) for 2–5 year olds, 771 mL/day (734, 808) for 6–12 year olds, and 1067 mL/day (855, 1279) for 13–19 year olds. Conclusions These results demonstrate that the average urine volume of children aged 2–12 years is less than 1 L, therefore, misclassification of iodine intakes may occur when urine volumes fall below or above 1 L. Future studies utilizing spot urine samples to assess iodine status should consider this when extrapolating UIC to represent iodine intakes of a population. Iodine (dpeaa)DE-He213 Urine (dpeaa)DE-He213 Urine volume (dpeaa)DE-He213 Children (dpeaa)DE-He213 Adolescents (dpeaa)DE-He213 Nutrition (dpeaa)DE-He213 Assessment (dpeaa)DE-He213 Grimes, Carley A. verfasserin aut Margerison, Claire verfasserin aut Riddell, Lynn J. verfasserin aut Skeaff, Sheila A. verfasserin aut West, Madeline L. verfasserin aut Nowson, Caryl A. verfasserin aut Enthalten in Zeitschrift für Ernährungswissenschaft Darmstadt : Steinkopff, 1960 59(2019), 7 vom: 29. Nov., Seite 3113-3131 (DE-627)461907356 (DE-600)2164295-3 1435-1293 nnns volume:59 year:2019 number:7 day:29 month:11 pages:3113-3131 https://dx.doi.org/10.1007/s00394-019-02151-w kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_647 GBV_ILN_702 44.21 ASE AR 59 2019 7 29 11 3113-3131 |
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10.1007/s00394-019-02151-w doi (DE-627)SPR041018702 (SPR)s00394-019-02151-w-e DE-627 ger DE-627 rakwb eng 630 640 610 ASE 44.21 bkl Beckford, Kelsey verfasserin aut A systematic review and meta-analysis of 24-h urinary output of children and adolescents: impact on the assessment of iodine status using urinary biomarkers 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Purpose Urinary iodine concentration (UIC (μg/ml) from spot urine samples collected from school-aged children is used to determine the iodine status of populations. Some studies further extrapolate UIC to represent daily iodine intake, based on the assumption that children pass approximately 1 L urine over 24-h, but this has never been assessed in population studies. Therefore, the present review aimed to collate and produce an estimate of the average 24-h urine volume of children and adolescents (> 1 year and < 19 years) from published studies. Methods EBSCOHOST and EMBASE databases were searched to identify studies which reported the mean 24-h urinary volume of healthy children (> 1 year and < 19 years). The overall mean (95% CI) estimate of 24-h urine volume was determined using a random effects model, broken down by age group. Results Of the 44 studies identified, a meta-analysis of 27 studies, with at least one criterion for assessing the completeness of urine collections, indicated that the mean urine volume of 2–19 year olds was 773 (654, 893) (95% CI) mL/24-h. When broken down by age group, mean (95% CI) 24-h urine volume was 531 mL/day (454, 607) for 2–5 year olds, 771 mL/day (734, 808) for 6–12 year olds, and 1067 mL/day (855, 1279) for 13–19 year olds. Conclusions These results demonstrate that the average urine volume of children aged 2–12 years is less than 1 L, therefore, misclassification of iodine intakes may occur when urine volumes fall below or above 1 L. Future studies utilizing spot urine samples to assess iodine status should consider this when extrapolating UIC to represent iodine intakes of a population. Iodine (dpeaa)DE-He213 Urine (dpeaa)DE-He213 Urine volume (dpeaa)DE-He213 Children (dpeaa)DE-He213 Adolescents (dpeaa)DE-He213 Nutrition (dpeaa)DE-He213 Assessment (dpeaa)DE-He213 Grimes, Carley A. verfasserin aut Margerison, Claire verfasserin aut Riddell, Lynn J. verfasserin aut Skeaff, Sheila A. verfasserin aut West, Madeline L. verfasserin aut Nowson, Caryl A. verfasserin aut Enthalten in Zeitschrift für Ernährungswissenschaft Darmstadt : Steinkopff, 1960 59(2019), 7 vom: 29. Nov., Seite 3113-3131 (DE-627)461907356 (DE-600)2164295-3 1435-1293 nnns volume:59 year:2019 number:7 day:29 month:11 pages:3113-3131 https://dx.doi.org/10.1007/s00394-019-02151-w kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_647 GBV_ILN_702 44.21 ASE AR 59 2019 7 29 11 3113-3131 |
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Beckford, Kelsey @@aut@@ Grimes, Carley A. @@aut@@ Margerison, Claire @@aut@@ Riddell, Lynn J. @@aut@@ Skeaff, Sheila A. @@aut@@ West, Madeline L. @@aut@@ Nowson, Caryl A. @@aut@@ |
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When broken down by age group, mean (95% CI) 24-h urine volume was 531 mL/day (454, 607) for 2–5 year olds, 771 mL/day (734, 808) for 6–12 year olds, and 1067 mL/day (855, 1279) for 13–19 year olds. Conclusions These results demonstrate that the average urine volume of children aged 2–12 years is less than 1 L, therefore, misclassification of iodine intakes may occur when urine volumes fall below or above 1 L. 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A systematic review and meta-analysis of 24-h urinary output of children and adolescents: impact on the assessment of iodine status using urinary biomarkers |
| abstract |
Purpose Urinary iodine concentration (UIC (μg/ml) from spot urine samples collected from school-aged children is used to determine the iodine status of populations. Some studies further extrapolate UIC to represent daily iodine intake, based on the assumption that children pass approximately 1 L urine over 24-h, but this has never been assessed in population studies. Therefore, the present review aimed to collate and produce an estimate of the average 24-h urine volume of children and adolescents (> 1 year and < 19 years) from published studies. Methods EBSCOHOST and EMBASE databases were searched to identify studies which reported the mean 24-h urinary volume of healthy children (> 1 year and < 19 years). The overall mean (95% CI) estimate of 24-h urine volume was determined using a random effects model, broken down by age group. Results Of the 44 studies identified, a meta-analysis of 27 studies, with at least one criterion for assessing the completeness of urine collections, indicated that the mean urine volume of 2–19 year olds was 773 (654, 893) (95% CI) mL/24-h. When broken down by age group, mean (95% CI) 24-h urine volume was 531 mL/day (454, 607) for 2–5 year olds, 771 mL/day (734, 808) for 6–12 year olds, and 1067 mL/day (855, 1279) for 13–19 year olds. Conclusions These results demonstrate that the average urine volume of children aged 2–12 years is less than 1 L, therefore, misclassification of iodine intakes may occur when urine volumes fall below or above 1 L. Future studies utilizing spot urine samples to assess iodine status should consider this when extrapolating UIC to represent iodine intakes of a population. |
| abstractGer |
Purpose Urinary iodine concentration (UIC (μg/ml) from spot urine samples collected from school-aged children is used to determine the iodine status of populations. Some studies further extrapolate UIC to represent daily iodine intake, based on the assumption that children pass approximately 1 L urine over 24-h, but this has never been assessed in population studies. Therefore, the present review aimed to collate and produce an estimate of the average 24-h urine volume of children and adolescents (> 1 year and < 19 years) from published studies. Methods EBSCOHOST and EMBASE databases were searched to identify studies which reported the mean 24-h urinary volume of healthy children (> 1 year and < 19 years). The overall mean (95% CI) estimate of 24-h urine volume was determined using a random effects model, broken down by age group. Results Of the 44 studies identified, a meta-analysis of 27 studies, with at least one criterion for assessing the completeness of urine collections, indicated that the mean urine volume of 2–19 year olds was 773 (654, 893) (95% CI) mL/24-h. When broken down by age group, mean (95% CI) 24-h urine volume was 531 mL/day (454, 607) for 2–5 year olds, 771 mL/day (734, 808) for 6–12 year olds, and 1067 mL/day (855, 1279) for 13–19 year olds. Conclusions These results demonstrate that the average urine volume of children aged 2–12 years is less than 1 L, therefore, misclassification of iodine intakes may occur when urine volumes fall below or above 1 L. Future studies utilizing spot urine samples to assess iodine status should consider this when extrapolating UIC to represent iodine intakes of a population. |
| abstract_unstemmed |
Purpose Urinary iodine concentration (UIC (μg/ml) from spot urine samples collected from school-aged children is used to determine the iodine status of populations. Some studies further extrapolate UIC to represent daily iodine intake, based on the assumption that children pass approximately 1 L urine over 24-h, but this has never been assessed in population studies. Therefore, the present review aimed to collate and produce an estimate of the average 24-h urine volume of children and adolescents (> 1 year and < 19 years) from published studies. Methods EBSCOHOST and EMBASE databases were searched to identify studies which reported the mean 24-h urinary volume of healthy children (> 1 year and < 19 years). The overall mean (95% CI) estimate of 24-h urine volume was determined using a random effects model, broken down by age group. Results Of the 44 studies identified, a meta-analysis of 27 studies, with at least one criterion for assessing the completeness of urine collections, indicated that the mean urine volume of 2–19 year olds was 773 (654, 893) (95% CI) mL/24-h. When broken down by age group, mean (95% CI) 24-h urine volume was 531 mL/day (454, 607) for 2–5 year olds, 771 mL/day (734, 808) for 6–12 year olds, and 1067 mL/day (855, 1279) for 13–19 year olds. Conclusions These results demonstrate that the average urine volume of children aged 2–12 years is less than 1 L, therefore, misclassification of iodine intakes may occur when urine volumes fall below or above 1 L. Future studies utilizing spot urine samples to assess iodine status should consider this when extrapolating UIC to represent iodine intakes of a population. |
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Some studies further extrapolate UIC to represent daily iodine intake, based on the assumption that children pass approximately 1 L urine over 24-h, but this has never been assessed in population studies. Therefore, the present review aimed to collate and produce an estimate of the average 24-h urine volume of children and adolescents (> 1 year and < 19 years) from published studies. Methods EBSCOHOST and EMBASE databases were searched to identify studies which reported the mean 24-h urinary volume of healthy children (> 1 year and < 19 years). The overall mean (95% CI) estimate of 24-h urine volume was determined using a random effects model, broken down by age group. Results Of the 44 studies identified, a meta-analysis of 27 studies, with at least one criterion for assessing the completeness of urine collections, indicated that the mean urine volume of 2–19 year olds was 773 (654, 893) (95% CI) mL/24-h. When broken down by age group, mean (95% CI) 24-h urine volume was 531 mL/day (454, 607) for 2–5 year olds, 771 mL/day (734, 808) for 6–12 year olds, and 1067 mL/day (855, 1279) for 13–19 year olds. Conclusions These results demonstrate that the average urine volume of children aged 2–12 years is less than 1 L, therefore, misclassification of iodine intakes may occur when urine volumes fall below or above 1 L. 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