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Table 3 Factors associated with preterm birth among mothers who gave birth in public hospitals of central zone, Tigray, Ethiopia, 2018

From: Risk factors of preterm birth among mothers who gave birth in public hospitals of central zone, Tigray, Ethiopia: unmatched case–control study 2017/2018

Variables Category Cases Controls COR (95% CI) AOR (95% CI)
Number of ANC follow up < 4 51 (60.7%) 74 (42%) 1.09 (1.24, 3.52) 2.15 (1.19, 3.85)**
≥ 4 33 (39.3%) 102 (58%) 1 1
Pregnancy induced hypertension Yes 30 (60%) 18 (36%) 4.54 (2.35, 8.76) 3.24 (1.58, 6.67)**
No 20 (40%) 32 (64%) 1 1
Multiple pregnancy Yes 22 (44%) 17 (34%) 3.12 (1.56, 6.25) 2.5 (1.14, 5.33)**
No 28 (56%) 33 (66%) 1 1
Premature rapture of membrane Yes 16 (32%) 15 (30%) 2.38 (1.12, 5.08) 1.02 (0.39, 2.68)
No 34 (68%) 35 (70%) 1  
Maternal height ≤ 150 cm 7 (8%) 31 (17.6%) 0.4 (0.17, 0.96) 0.42 (0.16, 1.0)
> 150 cm 81 (92%) 145 (82.4%) 1 1
Birth defect Yes 15 (17%) 9 (5.1%) 3.81 (1.59, 9.11) 3.20 (1.22, 8.32)**
No 73 (83%) 167 (94.9%) 1 1
Fetal distress Yes 30 (34%) 17 (9.7%) 4.84 (2.48, 9.42) 4.0 (1.94, 8.23)**
No 58 (66%) 159 (90.3%) 1 1
  1. ** Variable are significantly associated with preterm birth at P-value of < 0.05