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Table 1 Magnitude of recall bias for campaign nets received and lost

From: Field durability of the same type of long-lasting insecticidal net varies between regions in Nigeria due to differences in household behaviour and living conditions

Location Recall of campaign nets received Recall of campaign nets lost
Year Mean persons per HH Mean nets reported received Nets per person reported % of first year Actual lost (received – present) Reported lost (% of actual)
Zamfara       
Year 1 8.33 2.35 0.2821 100% 47 41 (87.2%)
Year 2 7.76 1.86 0.2397 84.9% 70 37 (52.9%)
Year 3 7.99 1.77 0.2215 78.5% 84 26 (31.0%)
Nasarawa       
Year 1 8.39 1.73 0.2062 100% 243 144 (59.3%)
Year 2 8.71 1.71 0.1963 95.2% 162 83 (51.2%)
Year 3 8.52 1.57 0.1843 89.4% 293 211 (72.0%)
Cross River       
Year 1 5.36 1.63 0.3046 100% 75 40 (53.3%)
Year 2 5.71 1.40 0.2452 80.5% 69 35 (50.7%)
Year 3 5.55 1.41 0.2541 83.4% 70 25 (35.7%)
  1. HH = household.
  2. Nets received are measured by the nets reported received per person in the household compared to the first year results while nets lost are evaluated by comparing the reported number with the difference between nets received and actually observed.