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Table 1 airflow measurements in 20 houses in Thailand, Philippines, The Gambia and Tanzania using a bed net with a mesh of 220 holes per square inch

From: Airflow attenuation and bed net utilization: observations from Africa and Asia

  # Bed net Median airspeed outside net Median airspeed inside net Attenuation of airflow Median temp(21:00 to 6:00)0 C Median relative humidity(21:00 to 6:00)
Thailand 1 On/off 0.14 0.06 57% 25.5 43%
  2 On/off 0.11 0.06 45% 24.5 55%
  3 On/off 0.15 0.1 33% 24.2 67%
Philippines 4 On/off 0.14 0.06 57% 25.4 89%
  5 Inside/outside 0.06 0.03 50% 25.5 92%
  6 Inside/outside 0.08 0.03 63% 25.9 92%
  7 Inside/outside 0.11 0.08 27% 24.7 92%
  8 Inside/outside 0.09 0.03 67% 25.1 92%
  9 Inside/outside 0.09 0.06 33% 27.1 90%
The Gambia 10 Inside/outside 0.07 0.02 71% 26.3 66%
  11 Inside/outside 0.07 0.02 71% 28.4 62%
  12 Inside/outside 0.09 0.03 67% 25.1 58%
  13 Inside/outside 0.06 0.03 50% 27.0 50%
  14 Inside/outside 0.05 0.03 40% 28.1 56%
  15 Inside/outside 0.09 0.03 67% 26.0 61%
  16 Inside/outside 0.09 0.03 67% 24.3 57%
Tanzania 17 Inside/outside 0.06 0.04 33% 26.8 73%
  18 Inside/outside 0.12 0.06 50% 27.7 69%
  19 Inside/outside 0.14 0.08 43% 27.0 73%
  20 Inside/outside 0.08 0.02 75% 28.0 69%
Overall    0.09 0.04 50% 26.0 70%
  1. †No significant difference in temperature or humidity was detected inside and outside the net. (Note that the measurements were not conducted during the hottest period of the year); * p-value <0.001 comparing airspeed inside and outside bed net (Mann–Whitney two-sample statistic or Wilcoxon matched-pairs signed-ranks test).