Table 3.
Comparison between study groups on measures of malaria transmission from cross-sectional surveys in the modified intention-to-treat population
|
Survey 1* |
Survey 2† |
Survey 3‡ |
|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unmodified houses (n=370) | Modified houses (n=370) | OR (95% CI) | RR (95% CI) | p value | Unmodified houses (n=361) | Modified houses (n=365) | OR (95% CI) | RR (95% CI) | p value | Unmodified houses (n=354) | Modified houses (n=348) | OR (95% CI) | RR (95% CI) | p value | |
| Plasmodium falciparum prevalence | 2% (8/370) | 2% (7/370) | 0·87 (0·31 to 2·43) | .. | p=0·81 | 1% (5/361) | 1% (2/365) | 0·39 (0·08 to 2·04) | .. | p=0·27 | 1% (3/354) | 1% (2/348) | 0·68 (0·11 to 4·07) | .. | 0·67 |
| Prevalence of mild anaemia, >80 to 110 g/L | 31% (113/368) | 37% (136/370) | 1·31 (0·97 to 1·78) | .. | p=0·083 | 37% (135/361) | 37% (132/364) | 0·95 (0·70 to 1·29) | .. | p=0·75 | 31% (108/354) | 27% (97/348) | 0·88 (0·64 to 1·22) | .. | 0·44 |
| Prevalence of moderate anaemia (>50 to 80 g/L) | 5% (20/368) | 5% (17/370) | 0·84 (0·43 to 1·63) | .. | p=0·60 | 2% (7/361) | 4% (13/364) | 1·87 (0·74 to 4·75) | .. | p=0·19 | 1% (5/354) | 2% (7/348) | 1·43 (0·45 to 4·56) | .. | 0·54 |
| Prevalence of severe anaemia ≤50 g/L | <1% (1/368) | 0% (0/370) | .. | .. | .. | <1% (1/361) | <1% (1/364) | 0·99 (0·06 to 15·92) | .. | p=0·99 | 0% (0/354) | 0% (0/348) | .. | .. | .. |
| Mean haemoglobin, g/L | 11·39 | 11·30 | .. | −0·10 (−0·36 to 0·17) | p=0·47 | 11·33 | 11·24 | .. | −0·08 (−0·30 to 0·14) | p=0·47 | 11·85 | 11·85 | .. | 0·01 (−0·23 to 0·25) | 0·96 |
| Prevalence of enlarged spleen | <1% (1/368) | <1% (1/369) | 1·00 (0·06 to 16·00) | .. | p=1·00 | <1% (1/361) | 0% (0/364) | .. | .. | .. | <1% (1/351) | 0% (0/348) | .. | .. | .. |
Data are % (n/N), OR (95% CI), or RR (95% CI). OR=odds ratio. RR=rate ratio.
*
Survey 1 was done in December, 2016.
†
Survey 2 was done in June, 2017.
‡
Survey 3 was done in December, 2017.