From: Post-exposure serological responses to malaria parasites in potential blood donors
 | Presence of antibodies | Crude logistic regressiona | Adjusted logistic regressiona | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Overall n (%) | Yes n (%) | No n (%) | χ2 | p value | β i | p value | OR | CI 95% | β i | p value | OR | CI 95% | |
Birth in endemic areas n = 495 | |||||||||||||
 Yes | 120 (24.2) | 35 (53.0) | 85 (19.8) | 34.36 | <0.001 | 1.519 | <0.001 | 4.569 | (2.667;7.830) | 0.843 | 0.011 | 2.324 | (1.209;4.464) |
 No | 375 (75.8) | 31 (47.0) | 344 (80.2) | – | – | Reference category | – | – | – | Reference category | – | ||
First 5 years of life in endemic area n = 86 | |||||||||||||
 Yes | 75 (87.2) | 24 (92.3) | 51 (85.0) | 0.89 | 0.351 | 0.739 | 0.365 | 2.095 | (0.423;10.363) | b | |||
 No | 11 (12.8) | 2 (7.7) | 9 (15.0) | – | – | Reference category | – | ||||||
Previous history of malaria n = 485 | |||||||||||||
 Yes | 165 (34.0) | 51 (79.7) | 114 (27.1) | 68.50 | <0.001 | 2.358 | <0.001 | 10.565 | (5.539;20.152) | 2.183 | <0.001 | 8.872 | (4.344;18.118) |
 No | 320 (66.0) | 13 (20.3) | 307 (72.9) |  |  | Reference category | – | – | – | Reference category | – | ||
 |  |  |  |  |  |  | 0.788d |  |  |  | |||
Number of travels to endemic areas n = 480 | |||||||||||||
 1 | 220 (45.8) | 25 (44.6) | 195 (40.6) | 0.48 | 0.787 | −0.246 | 0.541 | 0.782 | (0.356;1.719) | b | |||
 2–9 | 189 (39.4) | 21 (37.5) | 168 (39.6) | −0.271 | 0.511 | 0.763 | (0.340;1.711) | ||||||
 ≥10 | 71 (14.8) | 10 (17.9) | 61 (14.4) | – | – | Reference category | – | ||||||
Length of stay n = 476 | |||||||||||||
 <6 month | 306 (64.3) | 20 (37.0) | 286 (67.8) | 19.69 | <0.001 | −1.274 | <0.001 | 0.280 | (0.155; 0.504) | c | |||
 ≥6 month | 170 (35.7) | 34 (63.0) | 136 (32.2) | – | – | Reference category | – | ||||||
Length of time since last stay n = 502 | 0.274d |  | |||||||||||
 <4 month | 213 (42.4) | 34 (50.7) | 179 (41.1) | 4.06 | 0.255 | 0.204 | 0.478 | 1227 | (0.697;5.128) | b | |||
 4 month–1 year | 50 (10.0) | 5 (7.5) | 45 (10.3) | −0.332 | 0.523 | 0.718 | (0.259;1.988) | ||||||
 1–3 years | 60 (12.0) | 4 (6.0) | 56 (12.9) | −0.774 | 0.169 | 0.461 | (0.153;1.388) | ||||||
 ≥3 years | 179 (35.7) | 24 (35.8) | 155 (35.6) | – | – | Reference category | – | ||||||
Age | – | – | – | – | – | 0.037 | 0.001 | 1.038 | (1.016;1.060) | c |