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Table 1 Characteristics of all workers in the clean room

From: Prevalence of Dry Eye Syndrome after a Three-Year Exposure to a Clean Room

Characteristics   Number (%)
Sex Male 350 (99.4)
  Female 2 (0.6)
Mean age (years) (mean ± SD) 31.4 ± 6.1  
Current smoker Yes 192
  No 157
Alcohol consumption over the previous week Under 70 ml 165
  Over 70 ml 187
Weekly working hours (hours) (mean ± SD) 59.1 ± 8.7  
Age (years) 20–29 161 (45.7)
  30–39 150 (42.6)
  40–49 36 (10.2)
  50–59 5 (1.5)
Position of employment Team member (manufacturing) 317 (90.1)
  Team leader (manufacturing) 25 (7.1)
  Clerk (professional) 2 (0.6)
Years worked in the clean room <1 73 (20.7)
  1 37 (10.5)
  2 86 (24.4)
  3 23 (6.5)
  4 8 (2.3)
  >5 50 (14.2)