Potential risk factor category | Number in each category | % | Unadjusted OR | P value | Adjusted OR for multivariate analysis | P value | Adjusted OR for final model | P value |
---|---|---|---|---|---|---|---|---|
Total | 1074 | 100 | 1074 | Â | 1068 | <0.001 | 1072 | <0.001 |
Recruitment site | Â | Â | Â | <0.001 | Â | <0.001 | Â | <0.001 |
 Kashikishi | 737 | 68.6 | 1.00 | 1.00 | 1.00 | |||
 Nchelenge | 337 | 31.4 | 1.80 (1.37–2.35) | 1.89 (1.43–2.50) | 1.81 (1.38–2.37) | |||
Age group | Â | Â | Â | <0.001 | Â | 0.145 | Â | Â |
 ≤20 | 295 | 27.5 | 1.00 | 1.00 |  |  | ||
 21–25 | 304 | 28.3 | 0.51 (0.37–0.72) | 0.63 (0.41–0.98) |  |  | ||
 26–30 | 244 | 22.7 | 0.51 (0.36–0.73) | 0.67 (0.41–1.20) |  |  | ||
 ≥30 | 231 | 21.5 | 0.45 (0.32–0.64) | 0.57 (0.34 –0.95) |  |  | ||
Marital status | Â | Â | Â | 0.043 | Â | 0.412 | Â | Â |
 Single | 201 | 18.7 | 1.00 | 1.00 |  |  | ||
 Marrieda | 873 | 81.3 | 0.72 (0.52–0.99) | 1.18 (0.78–1.80) |  |  | ||
Gravidity | Â | Â | Â | <0.001 | Â | <0.069 | Â | Â |
 Primigravidae | 259 | 24.1 | 1.00 | 1.00 |  |  | ||
 Secundigravidae | 165 | 15.4 | 0.74 (0.48–1.11) | 0.80 (0.48–1.33) |  |  | ||
 Multigravidae | 650 | 60.5 | 0.50 (0.37–0.68) | 0.58 (0.35–0.95) |  |  | ||
Bed-net ownership | Â | Â | Â | 0.015 | Â | 0.640 | Â | Â |
 No | 547 | 50.9 | 1.00 | 1.00 |  |  | ||
 Yes | 527 | 49.1 | 0.74 (0.58–0.94) | 1.13 (0.72–1.73) |  |  | ||
Bed-net usage (1071) | Â | Â | Â | 0.006 | Â | 0.213 | Â | Â |
 No | 659 | 61.5 | 1.00 | 1.00 |  |  | ||
 Yes | 412 | 38.5 | 0.75 (0.48–0.91) | 0.74 (0.48–1.18) |  |  | ||
IRS in past 12Â months (1025)b | Â | Â | Â | 0.257 | Â | Â | Â | Â |
 No | 800 | 78.1 | 1.00 |  |  |  | ||
 Yes | 225 | 21.9 | 1.19 (0.88–1.61) |  |  |  | ||
Wealth quintiles (1072) | Â | Â | Â | 0.072 | Â | 0.027* | Â | Â |
 Lowest | 216 | 20.1 | 1.00 | 1.00 |  |  | ||
 Second | 219 | 20.4 | 0.80 (0.54–1.17) | 0.73 (0.50–1.09) |  |  | ||
 Middle | 209 | 19.5 | 0.91 (0.61–1.34) | 0.76 (0.51–1.15) |  |  | ||
 Fourth | 214 | 20.0 | 1.08 (0.73–1.60) | 0.90 (0.59–1.38) |  |  | ||
 Highest | 214 | 20.0 | 0.64 (0.44–0.95) | 0.52 (0.35–0.80) |  |  | ||
HIV infection | Â | Â | Â | 0.057 | Â | 0.025 | Â | 0.045 |
 Negative | 936 | 87.1 | 1.00 | 1.00 | 1.00 | |||
 Positive | 138 | 12.9 | 1.30 (0.91–1.88) | 1.62 (1.09–2.39) | 1.46 (1.00–2.13) |