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Table 3 Multilevel logistic regression on the association between adolescent childbirth and under-five morbidity in sub-Saharan Africa

From: Maternal age at first childbirth and under-five morbidity in sub-Saharan Africa: analysis of cross-sectional data of 32 countries

Variables Model 0 Model I cOR (95 % CI) Model II aOR (95 % CI)
Fixed effects
 Age at first childbirth
  < 20 years   1.16***[1.13–1.19] 1.10** (1.07–1.12)
  ≥ 20 years   Reference Reference
 Random effects
  Primary sampling unit variance (95 % CI) 0.11 (0.09–0.15) 0.11 (0.08–0.14) 0.06 (0.05–0.08)
  Intraclass correlation coefficient 0.03 0.03 0.02
  Wald chi-square Reference 170.27*** 1430.54***
 Model fitness
   Log-likelihood -189072.57 -188907.15 -137588.17
   Akaike’s Information Criterion 378149.1 377820.3 275226.3
   Sample size 311,603 311,603 311,603
   Number of clusters 1610 1610 1610
  1. NB: Model II adjusted for mother’s age, marital status, pregnancy intention, place of residence, mother’s education level, wealth quintile, sex of child, child’s weight, number of ANC visits, place of delivery, and assistant during delivery; cOR=crude odds ratio; aOR=adjusted odds ratio
  2. *p < 0.05; **p < 0.01; ***p < 0.001