| Characteristic | Preterm delivery [N = 96] n (%) | COR (95% CI) value model I | AOR (95% CI) value model II |
| Age (years) | < 20 | 21 (21.9) | Ref. | Ref. | 20–34 | 60 (62.5) | 0.38 (0.22, 0.67), 0.001 | 0.63 (0.30, 1.33), 0.231 | 35–49 | 15 (15.6) | 0.45 (0.21, 0.94), 0.034 | 0.88 (0.35, 2.21), 0.791 | Educational level | No formal education | 21 (21.9) | Ref. | | Primary school | 11 (11.5) | 0.55 (0.25, 1.23), 0.146 | | JSS/JHS/middle school | 34 (35.4) | 0.59 (0.32, 1.08), 0.090 | | SHS/SSS/vocational | 18 (18.8) | 0.50 (0.25, 0.99), 0.048 | | University | 12 (12.5) | 0.41 (0.19, 0.89), 0.024 | | Occupation | Unemployed | 25 (26.0) | Ref. | | Private sector | 60 (62.5) | 0.78 (0.47, 1.30), 0.346 | | Public sector | 11 (11.5) | 0.58 (0.27, 1.24), 0.158 | | Marital status | Single | 46 (47.9) | Ref. | | Married | 50 (52.1) | 0.52 (0.34, 0.80), 0.003 | | Parity | Primiparous | 38 (39.6) | Ref. | | Multiparous | 58 (60.4) | 0.72 (0.46, 1.12), 0.146 | | Gravidity | Nulliparous | 38 (39.6) | Ref. | | Primiparous | 22 (22.9) | 0.64 (0.36, 1.13), 0.122 | | Multiparous | 29 (30.2) | 0.68 (0.40, 1.15), 0.152 | | Grand multiparous | 7 (7.3) | 1.81 (0.71, 4.61), 0.212 | | Delivery type | Normal/vaginal | 69 (71.9) | Ref. | Ref. | Caesarean section | 27 (28.1) | 1.63 (1.01,2.66), 0.047 | 2.14 (1.15, 3.99), 0.016 | Vacuum extraction | 0 (0.0) | 1.35 (0.06, 2.84), 0.847 | 2.40 (0.11, 5.24), 0.578 | SP/IPTp dosage | < 3 doses | 52 (54.2) | Ref. | Ref. | 3 doses | 30 (31.2) | 0.46 (0.28, 0.75), 0.002 | 0.77 (0.41, 1.45), 0.422 | > 3 doses | 14 (14.6) | 0.21 (0.11, 0.40), <0.001 | 0.43 (0.19, 0.97), 0.041 | ANC visits | < 4 | 23 (24.0) | Ref. | Ref. | 4 | 22 (22.9) | 0.92 (0.46, 1.84), 0.822 | 0.87 (0.38, 2.01), 0.750 | > 4 | 51 (53.1) | 0.27,(0.15, 0.47), <0.001 | 0.38 (0.18, 0.80), 0.010 | Hepatitis B infection | Negative | 92 (95.8) | Ref. | | Positive | 4 (4.2) | 0.93 (0.31, 2.74), 0.900 | | Syphilis infection | Negative | 94 (97.9) | Ref. | | Positive | 2 (2.1) | 3.08 (0.56, 17.08), 0.197 | | Hypertension status | Normotensive | 83 (86.5) | Ref. | | Hypertensive | 13 (13.5) | 0.94 (0.58, 1.55), 0.836 | | Anaemia status | Normal | 37 (38.5) | Ref. | Ref. | Anaemic | 59 (61.5) | 2.27 (1.27, 4.03), 0.005 | 1.69 (0.92, 3.10), 0.092 | Sickling status | Negative | 77 (80.2) | Ref. | | Positive | 19 (19.8) | 1.22 (0.71, 2.11), 0.469 | | Malaria infection | Negative | 61 (63.5) | Ref. | | Positive | 35 (36.5) | 2.78 (1.73, 4.43), <0.001 | |
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