Table 1 Association of selected background characteristics with preterm birth
From: Incidence and risk factors of preterm birth in a rural Bangladeshi cohort
Characteristics | Live births (n = 32,126) | Preterm births (n = 7,161) | RR | 95% CI | P value | |
|---|---|---|---|---|---|---|
Number | Number | Percent | ||||
Women’s age at delivery | ||||||
<20Â years | 1874 | 391 | 20.9 | 0.84 | 0.75-0.93 | <0.01 |
20-24Â years | 8993 | 1831 | 20.4 | 0.81 | 0.76-0.87 | <0.001 |
25-29 years | 10826 | 2412 | 22.3 | 0.89 | 0.84-0.95 | <0.001 |
30-34 years | 6479 | 1539 | 23.8 | 0.95 | 0.89-1.02 | >0.15 |
≥35 years | 3954 | 988 | 25.0 | Ref. | - |  |
Women’s education* | ||||||
Below primary | 15460 | 4009 | 25.9 | Ref. | - | Â |
Primary plus | 16666 | 3152 | 18.9 | 0.73 | 0.70-0.76 | <0.001 |
Husbands’ education* | ||||||
Below primary | 18025 | 4522 | 25.1 | Ref. | - | Â |
Primary plus | 14101 | 2639 | 18.7 | 0.75 | 0.71-0.78 | <0.001 |
Religion | ||||||
Muslim | 30684 | 6851 | 22.3 | Ref. | - | Â |
Others | 1442 | 310 | 21.5 | 0.96 | 0.87-1.06 | >0.45 |
Wealth quintile (Asset index score) | ||||||
Lowest quintile (Poorest) | 6283 | 1667 | 26.5 | 1.86 | 1.73-2.00 | <0.001 |
Second lowest | 6475 | 1691 | 26.1 | 1.83 | 1.71-1.97 | <0.001 |
Middle quintile | 6332 | 1541 | 24.3 | 1.71 | 1.59-1.84 | <0.001 |
Second highest | 6442 | 1323 | 20.5 | 1.44 | 1.34-1.56 | <0.001 |
Highest quintile (Richest) | 6594 | 939 | 14.2 | Ref. | - | Â |