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Table 2 Parameter estimates from linear mixed effects model predicting linear growth of infants

From: Adolescent pregnancy and linear growth of infants: a birth cohort study in rural Ethiopia

Fixed effects (n = 1378) Coefficient (β) SE P
Intercept 1.38 0.143 < 0.001*
Infant age (Time) 0.14 0.029 < 0.001*
Quadratic time effect (Time*Time) −0.01 0.002 < 0.001*
Maternal age (15–19 years) − 0.24 0.128 0.032
Maternal age*Time 0.05 0.034 0.179
LAZ at birth 0.38 0.029 < 0.001*
Maternal education
(ref = no formal education)
 Primary 0.05 0.077 0.518
 Primary*Time 0.02 0.007 0.051
  ≥ Secondary 0.10 0.135 0.417
  ≥ Secondary*Time 0.03 0.013 0.024
Wealth index (ref = low)
 Middle 0.21 0.084 0.004*
 Middle*Time −0.05 0.008 0.485
 High 0.13 0.084 0.018
 High*Time 0.01 0.008 0.245
 Iron-folate supplement (≥90 days) −0.07 0.074 0.305
 Iron-folate*Time 0.15 0.007 0.018
 Illness in 2 weeks (Yes) 0.05 0.070 0.495
 Illness in 2 weeks *Time −0.15 0.006 0.001*
Random effects
 Variance of random intercept 0.004 0.006  
 Variance of random slope 0.913 0.063  
 Covariance of random intercept and slope −0.033 0.005  
 Variance of residuals 0.402 0.011  
  1. Restricted maximum likelihood estimation (REML) was used to estimate the parameters, SE standard error, *Statistical significance after adjustment for multiple testing using Benjamini-Hochberg method