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Table 1 General characteristics of firefighters and non-firefighters

From: Pulmonary function decline in firefighters and non-firefighters in South Korea

Variables Firefighters (n = 322) Non-firefighters (n = 107) p
Character Mean SD* Mean SD p
Age (years) 43.6 6.9 44.1 10.1 0.645
Height (cm) 172.3 4.7 167.8 6.3 < 0.001
Weight (kg) 72.1 8.0 65.1 9.1 < 0.001
Waist circumference (cm) 84.3 5.1 79.7 5.0 < 0.001
Body mass index (kg/m2) 24.2 2.2 23.0 2.6 < 0.001
Exposure (years) 6.1 7.8 9.0 7.6 0.001
Weight change (kg) 0.8 3.3 0.3 2.9 0.185
  n % n %  
Physical activity (times/week)      
  < 3 95 29.5 61 58.1 < 0.001
  ≥3 227 70.5 44 41.9 < 0.001
Smoking      
  Yes 38 11.8 45 42.9 < 0.001
  No 284 88.2 60 57.1 < 0.001
  1. *SD standard deviation.