N episodes | Person-years of follow-up | Rate (episodes/100-PY) (95 % CI) | Univariable IRR (95 % CI) | P value | Multivariable IRR (95 % CI) | P value | |
---|---|---|---|---|---|---|---|
Gender | |||||||
Female | 79 | 802 | 9.9 (7.9–12.3) | 1 | 1 | 0.249 | |
Male | 118 | 998 | 11.8 (9.9–14.2) | 1.2 (0.9–1.8) | 0.175 | 1.2 (0.9–1.8) | |
Age (years) | |||||||
0–10 | 51 | 451 | 11.3 (8.6–14.9) | 1 | 1 | ||
10–20 | 56 | 436 | 12.8 (9.9–16.7) | 1.1 (0.6–1.7) | 0.847 | 0.9 (0.6–1.6) | 0.833 |
20–40 | 49 | 429 | 11.4 (8.6–15.1) | 1.1 (0.7–1.8) | 0.756 | 1.1 (0.7–1.8) | 0.746 |
40–60 | 28 | 328 | 8.5 (6.0–12.3) | 0.8 (0.4–1.4) | 0.433 | 0.8 (0.4–1.5) | 0.489 |
≥60 | 13 | 153 | 8.4 (4.9–14.5) | 0.8 (0.4–1.9) | 0.648 | 0.8 (0.4–1.9) | 0.621 |
Socio-economic status | |||||||
Lowest quintile | 76 | 702 | 10.9 (8.6–13.5) | 0.9 (0.6–1.3) | 0.592 | 0.9 (0.7–1.4) | 0.821 |
2nd–4th quintiles | 92 | 707 | 13.0 (10.6–16.0) | 1 | 1 | ||
Highest quintile | 29 | 320 | 9.1 (6.3–13.0) | 0.8 (0.5–1.4) | 0.415 | 0.8 (0.5–1.3) | 0.397 |
Season | |||||||
Rainy | 56 | 750 | 7.5 (5.7–9.7) | 1 | <0.001 | 1 | <0.001 |
Dry | 141 | 1049 | 13.4 (11.4–15.9) | 1.7 (1.3–2.3) | 1.7 (1.3–2.3) | ||
Use of ITN | |||||||
No | 138 | 857 | 16.1 (13.6–19.0) | 1 | <0.001 | 1 | <0.001 |
Yes | 59 | 943 | 6.3 (4.8–8.1) | 0.5 (0.3–0.7) | 0.5 (0.3–0.7) | ||
IRS in last 6 months | |||||||
No | 31 | 530 | 5.8 (4.1–8.3) | 1 | 0.001 | 1 | <0.001 |
Yes | 166 | 1200 | 13.8 (11.9–16.1) | 2.1 (1.3–3.4) | 1.9 (1.2–3.3) |