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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.