Table 1 Characteristics of the study population at the respective cross-sectional surveys
1986 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2003 | 2010 | |
|---|---|---|---|---|---|---|---|---|---|---|
Population a , n | 500 | 1,125 | 1,295 | 1,396 | 1,458 | 1,424 | 1,507 | 1,553 | n/a | n/a |
Cross-sectional survey, n | 470 | 555 | 792 | 712 | 326 | 337 | 509 | 889 | 105 | 808 |
Female, n (%) | 239 (51.1) | 300 (54.1) | 448 (56.6) | 403 (56.6) | 205 (62.9) | 187 (55.5) | 276 (54.2) | 476 (53.5) | 42 (40.0) | 407 (50.4) |
Age, y median (range) | 15 (0–90) | 15 (0–83) | 14 (0–84) | 14 (0–84) | 31 (1–86) | 22 (1–82) | 24 (2–78) | 17 (1–84) | 13 (10–19) | 15 (1–82) |
Children ≤16 y, n (%) | 260 (55.3) | 296 (53.3) | 435 (54.9) | 391 (54.9) | 38 (11.7) | 142 (42.1) | 183 (36.0) | 438 (49.3) | 91 (86.7) | 431 (53.3) |
Children 2–9 y, n (%) | 124 (26.4) | 154 (27.7) | 233 (29.4) | 209 (29.4) | 10 (3.1) | 29 (8.6) | 42 (8.2) | 243 (27.3) | 0 | 186 (23.0) |
Fever at survey, n (%) | nd | 6 (1.1) | 78 (9.8) | 89 (12.5) | 28 (8.6) | 5 (1.4) | 25 (4.9) | 152 (17.1) | 1 (1.0) | 23 (2.9) |
Fever at survey, 2–9 y, n (% of all febrile) | nd | 3 (50) | 60 (77.9) | 58 (65.2) | 7 (25) | 0 | 2 (8) | 95 (62.5) | 0 | 9 (39.1) |