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Table 2 Prevalence of self-reported low back pain and the associations with selected daily life conditions

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

  Male Female
  Total Prevalence(%) Pvalue1) PR adj 2) 95% CI Total Prevalence(%) Pvalue1) PR adj 2) 95% CI
Smoking           
Never 260 65.4   1   3812 73.3   1  
Ex-smokers 199 72.4 * 1.41 0.94–2.11 305 78.4 ** 1.31 0.98–1.73
Current smokers 523 75.1   1.59 1.15–2.02 598 81.6   1.61 1.29–2.00
Physical activity           
Yes, regularly 280 70.7   1   771 70.8   1  
No 718 72.8 n.s 1.15 0.84–1.56 4010 75.4 ** 1.27 1.07–1.50
Sleeping hours           
6 hours 553 71.6   1   3102 76.5   1  
7 hours 428 72.7 n.s 0.92 0.69–1.22 1632 71.4 ** 1.30 1.14–1.49
Having meals regularly           
Regularly 348 67.8   1   1949 73.5   1  
Irregularly 557 75.2 * 1.43 1.06–1.92 2636 75.5 n.s 1.11 0.97–1.26
  1. 1) Chi-square test was conducted for each item among men and among women. *p < 0.05, **p < 0.01.
  2. 2) Prevalence ratio was adjusted for age group.