Table 1.
Prevalence of infection in children 2 to < 15 years of age in Bioko, Equatorial Guinea, and Zambezia, Mozambique between 2006 and 2008 by indoor residual spraying (IRS) status of house and whether the child slept under a mosquito net the night before the survey
| Study | Survey year |
Low or high prevalence sites |
Unprotected | IRS only | Net only | IRS + net | Number in sample |
Odds ratio IRS + net relative to IRS only |
|---|---|---|---|---|---|---|---|---|
| Bioko | 2006 | low | 28 (22–36) | 21(16–27) | 21(15–28) | 13 (10–17) | 4094 | 0.56 (0.43–0.72); P < 0.001 |
| 2006 | high | 56(41–70) | 51 (45–57) | 39 (30–49) | 38 (27–50) | 902 | 0.59 (0.36–0.96); P = 0.036 | |
| 2007 | low | 25 (19–32) | 20(15–25) | 32 (21–45) | 19 (14–26) | 2506 | 0.99 (0.75–1.30); P = 0.92 | |
| 2007 | high | 52(40–64) | 43 (35–51) | 51 (36–65) | 30 (25–34) | 785 | 0.56 (0.41–0.76); P = 0.001 | |
| 2008 | low | 26 (15–42) | 22 (15–31) | 24 (19–31) | 17 (14–21) | 3012 | 0.74 (0.53–1.06); P = 0.093 | |
| 2008 | high | 61 (51–70) | 53 (52–54) | 45 (39–52) | 35 (18–56) | 476 | 0.48 (0.20–1.15); P = 0.094 | |
| All Bioko | 33 (20–31) | 25 (19–33) | 30 (26–36) | 19 (15–24) | 11,775 | 0.71 (0.59–0.86); P = 0.001 | ||
| Zambezia | 2006 | low | 31 (23–40) | 32 (21–44) | 40 (26–55) | 19 (16–24) | 693 | 0.52 (0.33–0.81); P = 0.006 |
| 2006 | high | 76 (65–85) | 58(44–71) | 77 (68–85) | 49 (32–67) | 1450 | 0.71 (0.51–0.99); P = 0.045 | |
| 2007 | low | 48(44–51) | 32 (31–34) | 30 (6.9–71) | 23 (15–35) | 286 | 0.63 (0.38–1.03); P = 0.064 | |
| 2007 | high | 76 (66–84) | 64 (53–73) | 67 (47–82) | 53 (42–63) | 2147 | 0.64 (0.49–0.84); P = 0.003 | |
| All Zambezia | 71 (61–80) | 54 (43–64) | 68 (52–80) | 43 (32–54) | 4,576 | 0.63 (0.50–0.79); P < 0.001 |