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. Author manuscript; available in PMC: 2010 Sep 1.
Published in final edited form as: Early Hum Dev. 2009 Jul 15;85(9):583–588. doi: 10.1016/j.earlhumdev.2009.06.004

Table 2.

Period Prevalence of Underweight Stratified by Sex, Time Period

Number of children with a weight/length ratio during each time interval Cohort (N=1939)
 Expected Prevalence (5.4%)*
N = Case in Time Period Period Prevalence z-statistic
6-12 mo of age (N=1684)
Male (N=888) 136 15.3 13.07
Female (N=796) 121 15.2 12.23
12-18 mo of age (N=1569)
Male (N=827) 118 14.3 11.28
Female (N=742) 122 16.4 13.31
19-24 mo of age (N=1549)
Male (N=813) 103 12.7 9.17
Female (N=736) 104 14.1 10.48
Total cases within the 6-24 month interval (N=1939)
Male (N=1014) 235 23.2 25.04
Female (N=925) 232 25.1 26.48
Total 467 24.0 36.40
*

All time periods p< 0.0001 compared to 5.4% prevalence of underweight nationally, Pediatric Nutrition Surveillance Report, 2002.