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Table 1 Demographic characteristics of subjects

From: Prevalence and risk factors for low back pain among professional cooks working in school lunch services

  LBP in 1 month
  Total Prevalence (%) Test1) PR non-adj 2) 95% CI
Gender      
Male 998 72.2   1  
Female 4781 74.7 n.s 1.13 0.97–1.32
Age      
39 1400 75.4   1  
40 ~ 49 1764 74.8 n.s 0.97 0.82–1.14
50 2615 73.3   0.90 0.78–1.05
Gender and age      
Male      
39 428 73.8   1  
40 ~ 49 337 73.0 n.s 0.96 0.69–1.32
50 233 68.2   0.76 0.54–1.08
Female      
39 972 76.0   1  
40 ~ 49 1427 75.2 n.s 0.96 0.79–1.16
50 2382 73.8   0.90 0.75–1.06
  1. 1) Chi-square test.
  2. 2) Prevalence ratio was not adjusted.