Table 1 Cohort characteristics for study of malaria mortality in children under 5Â years of age, Western Kenya
| Â | Person-years of observation | Population (%) | Number of malaria deaths (proportion, %) |
|---|---|---|---|
Sex | |||
 Female | 167,460 | 111,488 (50.2) | 1418 (48.9) |
 Male | 168,341 | 110,441 (49.8) | 1480 (51.1) |
Age | |||
 29– < 1 | 65,574 | 157,575* (20.5) | 1054 (36.4) |
 1 | 68,443 | 157,333* (20.5) | 931 (32.1) |
 2 | 67,509 | 152,978* (19.9) | 487 (16.8) |
 3 | 67,327 | 150,687* (19.6) | 267 (9.2) |
 4 | 66,947 | 149,150* (19.4) | 159 (5.5) |
Calendar year | |||
 2003 | 22,033 | 50,577** (6.6) | 245 (8.5) |
 2004 | 21,898 | 50,224** (6.5) | 306 (10.5) |
 2005 | 21,680 | 49,484** (6.5) | 215 (7.4) |
 2006 | 22,055 | 50,118** (6.5) | 171 (5.9) |
 2007 | 28,268 | 70,904** (9.2) | 138 (4.6) |
 2008 | 37,144 | 84,993** (11.1) | 553 (19.1) |
 2009 | 36,578 | 82,613** (10.8) | 395 (13.6) |
 2010 | 36,445 | 82,342** (10.7) | 280 (9.7) |
 2011 | 36,233 | 80,617** (10.5) | 205 (7.1) |
 2012 | 36,619 | 81,960** (10.7) | 182 (6.3) |
 2013 | 36,848 | 83,891** (10.9) | 208(7.3) |
Distance to health care | |||
 0–1 km | 73,111 | 48,033 (21.6) | 466 (16.1) |
 1–2 km | 107,030 | 70,794 (31.9) | 952 (32.9) |
 2 + km | 155,472 | 102,935 (46.4) | 1,479 (51.0) |
 Unknown | 188 | 167 (0.1) | 1 (0.0) |
Maternal education | |||
 None | 5,104 | 3,427 (1.6) | 56 (1.9) |
 Primary | 227,149 | 140,879 (63.5) | 2,196 (75.8) |
 Secondary | 36,805 | 24,006 (10.8) | 220 (7.6) |
 Higher | 3,459 | 2,340 (1.1) | 8 (0.3) |
 Unknown | 63,284 | 51,267 (23.1) | 418 (14.4) |
Mother´s age | |||
  < 20 | 66,716 | 50,258 (22.7) | 542 (18.7) |
 20–30 | 171,807 | 109,378 (49.3) | 1,552 (53.6) |
  > 30 | 84,313 | 47,133 (21.2) | 728 (25.1) |
 Unknown | 12,966 | 15,160 (6.8) | 76 (2.6) |
Socioeconomic status | |||
 Most poor | 54,839 | 35,785 (16.1) | 617 (21.3) |
 Very poor | 60,698 | 38,694 (17.4) | 592 (20.4) |
 Poor | 59,399 | 38,369 (17.3) | 508 (17.5) |
 Less poor | 55,764 | 36,455 (16.4) | 453 (15.6) |
 Least poor | 55,489 | 36,708 (16.5) | 393 (13.6) |
 Unknown | 49,612 | 35,918 (16.2) | 335 (11.6) |
Household size | |||
 1–2 | 104,621 | 52,445 (23.6) | 940 (32.4) |
 3–4 | 98,239 | 70,467 (31.8) | 849 (29.3) |
 5 +  | 124,727 | 90,977 (41.0) | 1,088 (37.5) |
 Unknown | 8,213 | 8,020 (3.6) | 21 (0.7) |
ITN ownership | |||
 None | 44,377 | 30,196 (13.6) | 524 (18.1) |
 1 or more | 63,924 | 39,717 (17.9) | 669 (23.1) |
 Unknown | 227,501 | 152,016 (68.5) | 1,705 (58.8) |