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 | |