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Table 2 Helmet use per 100 person-minutes of observation

From: Prevalence and factors associated with effective helmet use among motorcyclists in Mysuru City of Southern India

  Ridersa Pillion ridersa Totalb
Helmet use 77.8 36.3 57.1
Standard helmet use 50.7 21.8 36.3
Full-face helmet use 43.9 16.8 30.3
Proper helmet use 34.9 14.0 24.5
Effective helmet use 29.2 9.8 19.5
  1. Use per 100 person-minutes of observation = (Number of users × 100)/D
  2. D (Denominator) = Number of data collectors × number of days × (number of minutes/day)
  3. aFor Riders/Pillion riders = ( 1 × 28 × 90) = 2520 person-minutes of observation
  4. bFor total motorcyclists (riders + pillion) = (2 × 28 × 90) = 5040 person-minutes of observation
  5. Example for helmet use (riders) = 1961 × 100 /2520=77.8 helmet users per 100 person-minutes of observation