APPENDIX 1

Covariates Associated With Infant Weight Gain From Birth to 8 Weeks Old

NWeight-Gain z scoreP
MeanSD
Maternal height at birth, cm
    ≥1763710.181.00<.0001
    171 to <1769630.050.97
    166 to <171a1440−0.030.94
    161 to <166a1562−0.030.94
    156 to <161652−0.100.96
    151 to <156465−0.200.89
    <15181−0.320.88
Maternal age at birth, y
    <21179−0.131.07.002
    21 to <25a977−0.030.94
    25 to <30a2457−0.020.91
    30 to <35a1654−0.010.98
    ≥35504−0.161.00
Use of a car at birth
    Yesa5334−0.030.94.02
    No372−0.091.03
Health of infant at 4–6 wk of age
    No problemsa3550−0.010.93.0002
    Problems2221−0.08
Feeding difficulties (general) at 4–6 wk of age
    Noa5084−0.010.94<.0001
    Yes666−0.221.03
Feeding difficulties (poor sucking) at 4–6 wk of age
    Noa46770.020.93<.0001
    Yes924−0.310.98
  • a Reference group used in the multivariate analysis.