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Table 3 Multivariable multilevel generalized linear model for the effect of inter-pregnancy intervals on term low birth weight

From: Effects of inter-pregnancy intervals on preterm birth, low birth weight and perinatal deaths in urban South Ethiopia: a prospective cohort study

Variable Model-I
(Null model)
Model-II
ARR (95% CI)
Model-III
ARR (95% CI)
Model-IV
ARR (95% CI)
Fixed-effects
Inter-pregnancy interval in months
   < 18 2.26 (1.39, 3.68)** 2.20 (1.35, 3.58)**
  18–23 1.54 (0.91, 2.59) 1.48 (0.88, 2.50)
  24–60 1 1
Random-effects
 Community variance 0.7632* 0.5051* 0.4451* 0.3509*
 ICC (%) 18.83 13.31 11.92 9.64
 PCV (%) 33.82 41.68 54.02
Model fit statistics
  AIC 767.7 770.7 764.9 769.6
  Log-likelihood -381.9 -369.4 -378.5 -366.8
  1. ARR Adjusted Relative Risk, AIC Akaike Information Criterion, ICC Intra-class Correlation Coefficient, PCV Proportional Change in Variance, Model-I Model with no covariates, Model-II Model with only individual-level variables adjusted, Model-III Model with only community-level variables adjusted, Model-IV Model with both individual-level and community-level variables adjusted. RR adjusted for maternal age, husband education, maternal occupation, age at first childbirth, parity, mode of previous delivery, pregnancy intention, community maternal education and community wealth status
  2. Keys: ** = P < 0.01, * = P < 0.05, 1 = Reference category