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Table 2 Exposure models of adverse outcomes of pregnancy by birth interval

From: Determinants and consequences of short birth interval in rural Bangladesh: a cross-sectional study

Birth interval (months) N Events Crude OR* 95% CI Adjusted OR 95% CI
   N /1,000     
Adverse outcome of pregnancy  
>45 3,173 143 45.1 reference    reference   
33-44 1,030 54 52.4 1.19 0.86 1.65 1.21 0.87 1.70
21-32 879 42 47.8 1.07 0.75 1.52 1.13 0.78 1.65
<21 489 44 90.0 2.12 1.49 3.03 2.23 1.51 3.29
Perinatal mortality  
>45 3,173 124 39.1 reference    reference   
33-44 1,030 50 48.5 1.29 0.92 1.82 1.31 0.92 1.87
21-32 879 37 42.1 1.09 0.75 1.59 1.15 0.77 1.71
<21 489 41 83.8 2.31 1.60 3.35 2.33 1.55 3.50
Still birth rate  
>45 3,173 79 24.9 reference    reference   
33-44 1,030 28 27.2 1.09 0.70 1.69 1.10 0.70 1.73
21-32 879 19 21.6 0.85 0.51 1.42 0.92 0.54 1.56
<21 489 25 51.1 2.10 1.32 3.33 2.13 1.28 3.53
Neonatal mortality  
>45 3094 64 20.7 reference    reference   
33-44 1002 26 25.9 1.31 0.82 2.09 1.35 0.83 2.20
21-32 860 23 26.7 1.32 0.82 2.16 1.38 0.83 2.32
<21 464 19 40.9 2.10 1.24 3.55 2.28 1.28 4.05
Early neonatal mortality  
>45 3094 45 14.5 reference    reference   
33-44 1002 22 22.0 1.66 0.98 2.81 1.68 0.65 1.84
21-32 860 18 20.9 1.51 0.87 2.65 1.54 0.55 2.23
<21 464 16 34.5 2.63 1.46 4.74 2.59 0.53 2.73
  1. *The crude analyses were adjusted for clustering.
  2. The OR’s were adjusted for maternal age, parity, previous birth outcome, maternal religion, education and household assets, tea garden residence and clustering.