TABLE 2

Mean Age, Weight, and Weight-for-Age z Score According to Survey Month and Summary of Last Weight Measured

Survey Month When Infants' Weight Measured at a Doctor's Office Was ReportedLast Weight Measured for Infants Aged >6 mo
35712
Sample size, n21261898166115121896
Age at weight measurement, mean (SD), mo2.33 (0.58)4.21 (0.61)6.38 (0.66)11.97 (0.91)10.87 (2.31)
Weight, mean (SD), kg5.54 (0.88)6.77 (1.07)7.84 (1.14)9.58 (11.37)9.28 (1.40)
Weight-for-age z score, mean (SD)0.34 (1.13)0.26 (1.29)0.07 (1.40)−0.38 (1.48)−0.25 (1.16)
Biologically implausible z score
    Less than −5410890
    More than 512520
Dichotomized z-score distribution, %
    >124.823.619.711.513.0
    ≤175.276.480.388.587.0