Table 4.
Incidence rate of ILI and laboratory-confirmed influenza among children of participated schools during the 10-week observation period from June to September 2015
| Description | ILI | Laboratory-confirmed influenza | ||
|---|---|---|---|---|
| Control | Intervention | Control | Intervention | |
| n/T (IR per 1,000 student-week; 95% CI) | n/T (IR per 1,000 student-week; 95% CI) | n/T (IR per 1,000 student-week; 95% CI) | n/T (IR per 1,000 student-week; 95% CI) | |
| Total children | 1,560/57,780 (27; 17–42) | 1,126/50,770 (22; 17–29) | 43/6,890 (6; 4–10) | 15/5,080 (3; 2–4) |
| According to gender* | ||||
| Boys | 607/26,770 (23; 14–36) | 446/24,010 (19; 14–24) | 18/2,610 (7; 4–13) | 8/1,910 (4; 2–8) |
| Girls | 953/30,730 (31; 20–48) | 680/26,740 (25; 19–33) | 25/4,280 (6; 4–10) | 7/3,170 (2; 1–4) |
| According to grade of students | ||||
| Nursery | 144/5,120 (28; 15–53) | 77/5,770 (13; 8–24) | 5/540 (9; 2–30) | 1/300 (3; 1–16) |
| Grade 1 | 310/11,690 (27; 16–43) | 169/8,690 (19; 14–28) | 4/1,040 (4; 1–12) | 1/650 (2; 1–11) |
| Grade 2 | 335/13,640 (25; 15–42) | 250/10,040 (25; 18–35) | 6/1,330 (5; 2–9) | 2/1,110 (2; 1–6) |
| Grade 3 | 316/10,690 (30; 20–43) | 228/10,260 (22; 15–32) | 6/1,500 (4; 2–7) | 4/1,040 (4; 2–8) |
| Grade 4 | 267/8,190 (33; 24–44) | 222/8,830 (25; 20–31) | 10/1,430 (7; 3–14) | 4/1,070 (4; 1–10) |
| Grade 5 | 188/8,450 (22; 10–50) | 180/7,180 (25; 19–33) | 12/1,050 (11; 8–17) | 3/910 (3; 1–10) |
| According to wealth status (household)† | ||||
| Poorest | 51/2,140 (24; 14–41) | 20/1,320 (15; 8–29) | 0/240 (0) | 0/110 (0) |
| Below middle | 35/1,510 (23; 14–38) | 24/1,230 (20; 11–34) | 0/150 (0) | 0/120 (0) |
| Middle | 55/1,820 (30; 14–67) | 34/1,250 (27; 19–39) | 2/300 (7; 2–23) | 0/130 (0) |
| Upper middle | 50/1,870 (27; 13–55) | 22/1,300 (17; 9–34) | 1/290 (3; 1–24) | 1/120 (8; 1–58) |
| Rich | 41/1,380 (30; 19–47) | 35/1,780 (20; 13–30) | 3/190 (16; 6–44) | 1/210 (5; 1–27) |
| According to cooking fuel at household† | ||||
| Wood/kerosene/charcoal | 15/590 (25; 15–44) | 16/880 (18; 9–38) | 0/70 (0) | 0/50 (0) |
| Gas/electricity | 217/8,130 (27; 15–46) | 119/6,000 (20; 15–26) | 6/1,100 (5; 3–11) | 2/640 (3; 1–11) |
IR = incidence rate; ILI = influenza-like illness; T = total student-week; n = total episodes of ILI/influenza positive.
* Information missing for 30 children (28 children in the control schools and two children in the intervention schools).
† Only 15% of children were surveyed at the household level.