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Table 2 Summary of data collected from SidePak monitors located on wing landings, prison cells and whilst attached to staff members

From: Second-hand smoke in four English prisons: an air quality monitoring study

  Sample locations
PM2.5 Wing landings Prison cellsb Attached to staff membersa
Total Datasets (average duration, hours) 48 (6.5) 13 (4.88)  
Arithmetic Mean (μg/m3) 40.08 103.1
 Standard Deviation 57.08 237.47
 Range 0 – 1124 0 – 2684
 Median 30.78 27.52
Geometric Mean (μg/m3) 32.57 59.2
 Interquartile Range 16.40 - 35.85 10.49 – 90.63
 Non-Smoking Locations (average duration, hours) 6 (5.18) 8 (5.12)
  Arithmetic Mean (μg/m3) 5.90 16.98
   Standard Deviation 2.90 15.46
   Range 0 – 22 1 – 102
   Median 5.71 13.39
  Geometric Mean (μg/m3) 5.58 14.88
   Interquartile Range 5.29 – 7.77 6.9 – 25.82
 Smoking Locationsc(average duration, hours) 42 (6.66) 5 (4.51) 22 (4.18)
  Arithmetic Mean (μg/m3) 43.87 226.16 23.51
   Standard Deviation 58.95 333.08 34.01
   Range 1 – 1124 8- 2684 2 – 608
   Median 32.86 162.90 19.04
  Geometric Mean (μg/m3) 35.57* 122.52* 18.57
   Interquartile Range 18.9 – 36.97 81.61 – 163.14 11.37 – 18.59
  1. *Two-sample t-test comparing smoking and non-smoking locations, denotes significance (p < 0.001)
  2. aAll staff members sampled worked on locations where smoking was permitted in cells only
  3. bAll prison cells sampled were located on wings where smoking was permitted in cells only
  4. cSmoking locations were those where smoking was permitted in cells only