Table 4. Factors associated with recurrent preterm births among women delivered at KCMC (N = 5946).
| Characteristics | Recurrence of Preterm birth | |||
|---|---|---|---|---|
| Total (N) | n (%) | cRR,95% CI | P-value | |
| in previous birth) | ||||
| Term delivery | 5,405 | 525 (9.7) | 1 | |
| Preterm delivery | 541 | 132(24.4) | 2.51[2.11,2.97] | <0.001 |
| Pre-eclampsia | ||||
| No | 5,763 | 622(10.8) | 1 | |
| Yes | 183 | 35(19.1) | 1.77[1.29,2.41] | <0.001 |
| Inter-pregnancy interval (months) | ||||
| 24–59 | 2,805 | 281(10) | 1 | |
| <24 | 1,902 | 227(11.9) | 1.19[1.01,1.40] | 0.036 |
| >59 | 1,049 | 130(12.4) | 1.24[1.02,1.51] | 0.034 |
| Birth weight | ||||
| Normal birth weight | 5,441 | 538(9.9) | 1 | |
| Low birth weight | 442 | 98(22.2) | 2.24[1.85,2.71] | <0.001 |
| Very low birth weight | 53 | 19(35.8) | 3.62[2.51,5.21] | 0.001 |
| Extremely low birth weight | 10 | 2(20) | 2.02[0.58,6.99] | 0.267 |
| Premature rupture of membrane | ||||
| No | 5,873 | 642(10.9) | 1 | |
| Yes | 73 | 15(20.5) | 1.00[0.57,1.76] | 0.988 |
| Clinical subtypes | ||||
| Spontaneous delivery | 359 | 78(21.7) | 1 | |
| Medically indicated delivery | 178 | 54(30.3) | 1.40[1.03,1.88] | 0.028 |
| Term delivery | 5409 | 527(9.74) | 0.45[0.36,0.57] | <0.001 |
| Mother’s education | ||||
| No formal education | 56 | 7(12.5) | 1 | |
| Primary education | 2,880 | 350(12.2) | 0.98[0.49,1.96] | 0.945 |
| Secondary education | 872 | 105(12) | 0.96[0.47,1.96] | 0.906 |
| Tertiary education | 2,138 | 195(9.1) | 0.73[0.36,1.48] | 0.384 |
| Alcohol use | ||||
| No | 4,196 | 485(11.6) | 1 | |
| Yes | 1,750 | 172(9.8) | 0.85[0.72,1.00] | 0.055 |
| Mother’s age (years) | ||||
| 15-<25 | 786 | 100(12.7) | 1 | |
| 25–35 | 3,848 | 404(10.5) | 0.82[0.67,1.01] | 0.059 |
| >35 | 1,303 | 152(11.7) | 0.92[0.72,1.16] | 0.46 |
cRR: Crude risk ratio