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Table 1 Characteristics of the study population at the respective cross-sectional surveys

From: Epidemiology of malaria in a village in the Rufiji River Delta, Tanzania: declining transmission over 25 years revealed by different parasitological metrics

  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)
  1. aThe population size is based on the individuals registered in the research database at the respective years.