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Table 1 Descriptive characteristics of the study cohort, Liwonde, Malawi 2012-2013

From: A cohort study of the effectiveness of insecticide-treated bed nets to prevent malaria in an area of moderate pyrethroid resistance, Malawi

Characteristic Results
Number of children enrolled 1,199
Number of households included 907
Median age at enrolment in months (IQR)* 30 (17, 44)
Number of children who completed one year follow-up, n (%) 1,018 (85)
Person-years at risk 905
Female, n (%) 579 (48)
Plasmodium infection at baseline (PCR), n/N (%)* 440/1,192 (37)
Median IDW malaria prevalence <1 km (IQR)* 35% (24, 48)
Anaemic (Hb <11 g/dl), n (%) 860 (72)
Caregiver completed primary school, n (%) 215 (18)
Bed net used, n/N (%) 922/1,175 (78)
ITN used, n/N (%) 516/1,174 (44)
ITN has ≥1 hole fist-sized or larger, n/N (%) 110/404 (21)
Median number of ITNs within 300 m (IQR)  
  Baseline 8 (5, 21)
  After ITN distribution 48 (27, 116)
Malaria infections** 1,909
Median malaria incidence per person-year (IQR) 1.2 (0, 3.6)
  1. *IQR = Interquartile range; PCR = polymerase chain reaction; IDW = inverse distance-weighted; Hb = haemoglobin; PPY = per person year.
  2. **As measured by malaria rapid diagnostic tests.