Table 3 Sample characteristics and risk factors for malaria infection and bed net use in school children in Tanzania
|  | Total children | Malaria (N = 49,102) | Bed net use (N = 47,800) | |||||
|---|---|---|---|---|---|---|---|---|
Children tested positive | Children sleeping under bed net | |||||||
N | % | n | % | 95% CI | n | % | 95% CI | |
Total | 49,113 | 100 | 10,627 | 22 | (19.6–23.9) | 33,284 | 70 | (67.6–71.6) |
Gender | ||||||||
 Male | 24,205 | 49.3 | 5606 | 23.2 | (21.0–25.5) | 16,077 | 68.3 | (66.1–70.3) |
 Female | 24,681 | 50.3 | 4940 | 20.0 | (18.0–22.2) | 17,078 | 71.0 | (68.9–73) |
 Missing | 227 | 0.5 | 81 | 35.7 | – | 129 | 63.9 | – |
Age | ||||||||
 < 9 | 9075 | 18.5 | 1651 | 18.2 | (16.1–20.5) | 5974 | 68.8 | (66.3–71.2) |
 9–12 | 18,892 | 38.5 | 4045 | 21.4 | (19.2–23.8) | 13,106 | 71.2 | (69.2–73.3) |
 > 12 | 20,730 | 42.2 | 4847 | 23.4 | (21.2–25.7) | 13,957 | 68.6 | (66.3–70.8) |
 Missing | 416 | 0.9 | 84 | 20.2 | – | 247 | 62.7 | – |
Parental education | ||||||||
 No school | 3736 | 7.6 | 1074 | 28.8 | (24.4–33.5) | 1930 | 54.7 | (50.2–59.1) |
 Primary | 23,445 | 47.7 | 5163 | 22.0 | (19.4–24.8) | 14,968 | 65.8 | (63.1–68.3) |
 Secondary | 4547 | 9.3 | 808 | 17.8 | (15.1–20.9) | 3430 | 77.5 | (74.8–80) |
 Diploma or higher | 525 | 1.1 | 52 | 9.9 | (7.0–13.9) | 415 | 80.7 | (76.1–84.7) |
 Missing | 5424 | 11.0 | 970 | 17.9 | – | 3617 | 69.7 | – |
 Not interviewed* | 11,436 | 23.3 | 2560 | 22.4 | – | 8924 | 78.4 | – |
Bed net use | ||||||||
 No | 14,516 | 29.6 | 2943 | 20.3 | (17.8–23.0) | – | – | – |
 Yes | 33,284 | 67.8 | 7270 | 21.9 | (19.6–24.2) | – | – | – |
 Missing | 1313 | 2.7 | 414 | 31.5 | – | – | – | – |
Zone | ||||||||
 Eastern | 6967 | 14.2 | 1269 | 18.2 | (13.3–24.4) | 5819 | 86.6 | (83.4–89.3) |
 Western | 4805 | 9.8 | 1449 | 30.2 | (25.5–35.2) | 3221 | 68.8 | (64–73.2) |
 Southern | 4002 | 8.1 | 1344 | 33.6 | (27.2–40.8) | 3255 | 81.6 | (76.8–85.6) |
 Southern highlands | 4116 | 8.4 | 495 | 12.0 | (7.2–19.4) | 2350 | 58.7 | (52.4–64.7) |
 Southwest highlands | 4867 | 9.9 | 846 | 17.4 | (11.6–25.2) | 2946 | 61.6 | (55.3–67.5) |
 Central | 5653 | 11.5 | 156 | 2.8 | (1.6–4.6) | 3077 | 55.1 | (49.6–60.5) |
 Northern | 6191 | 12.6 | 317 | 5.1 | (3.1–8.4) | 3360 | 55.6 | (49.4–61.7) |
 Lake | 12,512 | 25.5 | 4751 | 38.0 | (33.6–42.5) | 9256 | 77.2 | (73.1–80.8) |
 Missing | 0 | 0.0 | 0 | 0.0 | – | 0 | 0.0 | – |
Area | ||||||||
 Urban | 9708 | 19.8 | 588 | 6.1 | (4.0–9.1) | 7866 | 82.2 | (78.7–85.2) |
 Rural | 39,405 | 80.2 | 10,039 | 25.5 | (23.1–28.0) | 25,418 | 66.5 | (64.1–68.8) |
 Missing | 0 | 0.0 | 0 | 0.0 | – | 0 | 0.0 | – |
Eco-zone (tropical) * | ||||||||
 Dry forest | 7124 | 19.0 | 2247 | 31.5 | (25.9–37.8) | 5417 | 79.4 | (74.7–83.4) |
 Moist decid. forest | 5819 | 15.5 | 1816 | 31.2 | (25.1–38) | 3786 | 67.8 | (62–73.1) |
 Mountain system | 6053 | 16.1 | 723 | 11.9 | (7.9–17.6) | 3329 | 57.0 | (50.3–63.5) |
 Rainforest | 3331 | 8.9 | 1272 | 38.2 | (28.6–48.7) | 2664 | 82.8 | (76.3–87.8) |
 Scrubland | 15,216 | 40.5 | 2009 | 13.2 | (10.3–16.7) | 9078 | 61.2 | (57.4–64.9) |
 Missing | 11,570 | 23.6 | 2560 | 22.2 | – | 9010 | 77.9 | – |
Altitude (m) | ||||||||
 < 750 | 13,228 | 26.9 | 3248 | 24.6 | (20.7–28.9) | 10,697 | 82.7 | (80.1–85) |
 750–1250 | 18,901 | 38.5 | 5040 | 26.7 | (23.3–30.4) | 13,284 | 72.0 | (68.8–75) |
 1250–1750 | 14,581 | 29.7 | 2335 | 16.0 | (12.6–20.1) | 8434 | 59.8 | (56–63.4) |
 > 1750 | 2403 | 4.9 | 4 | 0.2 | (0.1–0.5) | 869 | 37.8 | (30.5–45.7) |
 Missing | 0 | 0.0 | 0 | 0.0 | – | 0 | 0.0 | – |