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Table 3 Evaluation of standard deviation of anthropometric indices overall and by age group, by the quality of age ascertainment (based on percentage of children with exact date of birth)

From: Comparison of anthropometric data quality in children aged 6-23 and 24-59 months: lessons from population-representative surveys from humanitarian settings

Indicator   Birthday > 90%
(mean)
Birthday 10–90%
(mean)
Birthday < 10%
(mean)
WHZ N 272 309 131
Children 6–59 m 1.03 1.06 1.08
Children 6–23 m 1.08 1.11 1.15
Children 24–59 m 0.99 1.02 1.03
Differencea 0.09*** 0.10*** 0.12***
Correlationb 0.62*** 0.51*** 0.53***
% youngerc better 5.2% 6.9% 2.3%
WAZ N 272 309 131
Children 6–59 m 1.02 1.05 1.05
Children 6–23 m 1.10 1.14 1.14
Children 24–59 m 0.96 0.99 0.99
Differencea 0.15*** 0.15*** 0.15***
Correlationb 0.64*** 0.55*** 0.53***
% youngerc better 2.0% 3.0% 0.6%
HAZ N 272 309 131
Children 6–59 m 1.17 1.24 1.27
Children 6–23 m 1.21 1.28 1.29
Children 24–59 m 1.13 1.20 1.24
Differencea 0.09*** 0.08*** 0.06***
Correlationb 0.68*** 0.69*** 0.64***
% youngerc better 8.3% 11.5% 5.8%
MUACZ N 264 307 131
Children 6–59 m 0.95 0.97 0.97
Children 6–23 m 1.00 1.02 1.04
Children 24–59 m 0.90 0.92 0.92
Differencea 0.10*** 0.10*** 0.12***
Correlationb 0.62*** 0.55*** 0.57***
% youngerc better 4.4% 4.8% 1.1%
BMIZ N 272 309 131
Children 6–59 m 1.05 1.09 1.12
Children 6–23 m 1.10 1.14 1.18
Children 24–59 m 1.01 1.05 1.06
Differencea 0.09*** 0.10*** 0.12***
Correlationb 0.68*** 0.54*** 0.61***
% youngerc better 5.9% 8.0% 2.5%
  1. WHZ Weight-for-height z-score, WAZ Weight-for-age z-score, HAZ Height-for-age z-score, MUACZ Mid-upper arm circumference-for-age z-score, BMIZ BMI-for-age z-score, SD Standard deviation, m months
  2. P-values were calculated using parametric tests
  3. *p < 0.05; **p < 0.01; ***p < 0.001
  4. aDifference between 6–23 and 24–59 months age groups
  5. b Correlation between 6–23 and 24–59 age groups
  6. c Percentage of surveys where absolute values for age group 6–23 months were lower that absolute values for age group 24–59 months