TABLE 1

Characteristics of US Children Aged 6 to 23 Months by Survey Cycle, 1976 to 2014

1976–19801988–19941999–20022003–20062007–20102011–2014P for Trenda
N (unweighted)10262470109711951055864
Sex
 Boy, % (SE)51.1 (2.3)52.2 (1.2)55.5 (2.2)51.4 (1.8)48.6 (1.7)53.0 (2.0).12
Age, mo
 Mean (SE)14.8 (0.2)14.5 (0.2)14.2 (0.2)14.9 (0.2)14.3 (0.2)14.4 (0.2).20
Race/Hispanic originb
 Non-Hispanic white, % (SE)NA64.1 (2.1)53.9 (2.6)60.7 (2.9)53.0 (3.9)48.6 (4.3).001
 Non-Hispanic black, % (SE)NA16.4 (1.3)12.6 (1.6)13.3 (1.7)13.4 (1.5)13.0 (2.1).15
 Mexican American, % (SE)NA9.8 (1.0)16.9 (1.9)15.6 (1.7)18.5 (2.4)18.6 (3.3).002
Reported birth weight
 Low birth weight, % (SE)7.8 (1.2)9.0 (0.8)10.4 (1.1)8.8 (1.0)8.5 (1.1)9.4 (1.1).44
 Mean birth weight, kg (SE)3.36 (0.03)3.36 (0.02)3.31 (0.03)3.28 (0.02)3.31 (0.03)3.31 (0.02).01
 Mean birth weight z score (SE)0.08 (0.06)0.05 (0.05)−0.06 (0.06)−0.10 (0.05)−0.02 (0.06)−0.04 (0.04).02
 Mean relative birth weight, kg (SE)0.07 (0.03)0.07 (0.02)0.01 (0.03)−0.01 (0.02)0.03 (0.03)0.02 (0.02).01
Ever breastfed
 Yes, % (SE)NA54.3 (1.9)67.8 (2.2)73.2 (26.8)72.9 (1.8)79.2 (1.5)<.001
Anthropometric measures
 Weight-for-age n (unweighted)1026246295911901048859
  Mean z score (SE)0.48 (0.04)0.48 (0.02)0.46 (0.04)0.47 (0.05)0.48 (0.03)0.48 (0.05).92
  Mean relative weight, kg (SE)0.65 (0.05)0.64 (0.03)0.61 (0.06)0.66 (0.06)0.65 (0.04)0.67 (0.06).84
 Length-for-age, n (unweighted)10152447108211761045854
  Mean z score (SE)0.11 (0.05)0.19 (0.03)0.05 (0.05)0.12 (0.05)0.05 (0.05)0.06 (0.06).19
 Weight-for-length, n (unweighted)1014244295411761045853
  Mean z score (SE)0.63 (0.06)0.55 (0.03)0.62 (0.04)0.57 (0.06)0.63 (0.03)0.63 (0.04).68
  • The z score and relative values are based on comparison with the WHO 2006 growth charts. Data source: NHANES. NA, not available.

  • a Trend tested by using orthogonal contrast matrices (categorical) and linear regression (continuous).

  • b Children of other race/Hispanic origin groups are not classified separately, but are included in all categories of other characteristics.