TY - JOUR
T1 - The impact of school-day variation in weight and height on National Child Measurement Programme body mass index-determined weight category in Year 6 children
AU - Routen, A. C.
AU - Edwards, M. G.
AU - Upton, D.
AU - Peters, D. M.
PY - 2011/5/1
Y1 - 2011/5/1
N2 - Background: In England, the National Child Measurement Programme (NCMP) annually measures the weight and height of Year 6 schoolchildren (age 10-11 years). While measurement protocols are defined, the time of measurement within the school day is not. This study examined the impact of school-day variation in weight and height on NCMP body mass index (BMI)-determined weight category in Year 6 children. Methods: Standing height and weight were measured in morning and afternoon sessions in 74 children, boys (n= 34; height: 141.16 ± 7.45cm; weight: 36.48 ± 9.46kg, BMI: 18.19 ± 3.98kg/m2) and girls (n= 40; height: 144.58 ± 7.66cm; weight: 42.25 ± 11.29kg; BMI: 19.97 ± 3.98kg/m2) aged 11 ± 0.3 years. Results: In the whole sample, height decreased (Mean =-0.51cm, 95% CI: -0.39 to -0.64cm, P= 0.01), weight did not change (Mdn = 36.40 to 36.35, P= 0.09) and BMI increased (Mdn = 18.04 to 18.13, P= 0.01). In girls weight increased (Mdn = 41.40 to 41.60, P= 0.01). BMI percentile increased (Mdn = 57th to 59.5th centile, P= 0.01). One girl increased in BMI category from morning to afternoon according to the clinical cut-offs (≤2nd, >91st and >98th) and three girls increased BMI category according to the population monitoring cut-offs (≤2nd, ≥85th, ≥95th). Conclusions: School-day variation in height (and in girls alone, weight) impact upon increased BMI and BMI percentile in afternoon versus morning measurements in Year 6 children. Although not reaching statistical significance, resultant variation in categorization at the individual level may lead to unwarranted follow-up procedures being initiated. Further research with larger samples is required to further explore the impact of daily variability in height and weight upon both clinical and population monitoring BMI-determined weight status categorization in the NCMP.
AB - Background: In England, the National Child Measurement Programme (NCMP) annually measures the weight and height of Year 6 schoolchildren (age 10-11 years). While measurement protocols are defined, the time of measurement within the school day is not. This study examined the impact of school-day variation in weight and height on NCMP body mass index (BMI)-determined weight category in Year 6 children. Methods: Standing height and weight were measured in morning and afternoon sessions in 74 children, boys (n= 34; height: 141.16 ± 7.45cm; weight: 36.48 ± 9.46kg, BMI: 18.19 ± 3.98kg/m2) and girls (n= 40; height: 144.58 ± 7.66cm; weight: 42.25 ± 11.29kg; BMI: 19.97 ± 3.98kg/m2) aged 11 ± 0.3 years. Results: In the whole sample, height decreased (Mean =-0.51cm, 95% CI: -0.39 to -0.64cm, P= 0.01), weight did not change (Mdn = 36.40 to 36.35, P= 0.09) and BMI increased (Mdn = 18.04 to 18.13, P= 0.01). In girls weight increased (Mdn = 41.40 to 41.60, P= 0.01). BMI percentile increased (Mdn = 57th to 59.5th centile, P= 0.01). One girl increased in BMI category from morning to afternoon according to the clinical cut-offs (≤2nd, >91st and >98th) and three girls increased BMI category according to the population monitoring cut-offs (≤2nd, ≥85th, ≥95th). Conclusions: School-day variation in height (and in girls alone, weight) impact upon increased BMI and BMI percentile in afternoon versus morning measurements in Year 6 children. Although not reaching statistical significance, resultant variation in categorization at the individual level may lead to unwarranted follow-up procedures being initiated. Further research with larger samples is required to further explore the impact of daily variability in height and weight upon both clinical and population monitoring BMI-determined weight status categorization in the NCMP.
KW - Anthropometry
KW - Diurnal variation
KW - Measurement reliability
KW - Obesity
KW - Overweight
UR - http://www.scopus.com/inward/record.url?scp=79953705693&partnerID=8YFLogxK
U2 - 10.1111/j.1365-2214.2010.01204.x
DO - 10.1111/j.1365-2214.2010.01204.x
M3 - Article
C2 - 21276038
AN - SCOPUS:79953705693
SN - 0305-1862
VL - 37
SP - 360
EP - 367
JO - Child: Care, Health and Development
JF - Child: Care, Health and Development
IS - 3
ER -