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Table 3 Bi-variable and multivariable cox-regression analysis for predictors of premature birth, Northern Ethiopia, 2018 (N = 460)

From: Does short inter-pregnancy interval predicts the risk of preterm birth in Northern Ethiopia?

Characteristics N Outcome n (%) Hazard ratio, 95% CI
Event Censored Crude Adjusted
IPI
 Short 152 39 (25.9) 113 (74.1) 9.5 (4.6–19.6) 6.85 (3.07–15.31)
 Recommended 308 9 (2.9) 299 (97.1) 1  
Residence
 Rural 187 30 (16) 157 (84) 2.5 (1.37–4.41) 1.2 (0.61–2.35)
 Urban 273 18 (6.6) 255 (93.4) 1  
Planned pregnancy
 No 128 22 (17.2) 106 (82.8) 2.26 (1.28–3.99) 1.11 (0.57–2.13)
 Yes 332 26 (7.8) 306 (92.2) 1  
Number of ANC visits
 ≥ 4 255 11 (4.3) 244 (95.7) 1  
 1–3 190 31 (16.3) 159 (83.7) 4.0 (2.01–7.97) 2.24 (1.04–4.85)
Complication in current pregnancy
 No 413 33 (8.0) 380 (92) 1  
 Yes 47 15 (31.9) 32 (68.1) 4.78 (2.59–8.79) 3.16 (1.58–6.33)
History of perinatal death
 No 418 40 (9.6) 378 (91.4) 2.16 (1.01–4.61) 0.85 (0.36–2.03)
 Yes 42 8 (19) 34 (81) 1  
Newborn birth defect
 No 452 43 (9.5) 409 (90.5) 1  
 Yes 8 5 (62.5) 3 (37.5) 12.97 (5.11–32.87) 8.01 (2.56–25.07)
Mother hemoglobin level (g/dl)
 ≥ 11 375 32 (8.5) 343 (91.5) 2.33 (1.28–4.25) 0.91 (0.46–1.79)
 < 11 85 16 (18.8) 69 (81.2) 1  
Maternal age (years)
 15–24 75 9 (12) 66 (88) 1.68 (0.67–4.23)  
 25–34 260 30 (11.5) 230 (88.5) 1.64 (0.78–3.46)  
 35–48 125 9 (7.2) 116 (92.8) 1