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Table 3 Prevalence of self-reported low back pain and the associations with selected job-related factors

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
Work activities           
Number of cooked lunches per cook           
1–149 meals 412 69.7   1   2457 71.2   1  
150–199 meals 243 74.9 n.s 1.30 0.91–1.86 1319 79.1 ** 1.53 1.30–1.79
200 meals 340 73.2   1.19 0.87–1.60 985 77.5   1.39 1.17–1.65
Breaks in morning session           
Yes 549 68.9   1   2122 70.2   1  
No 426 77.0 ** 1.50 1.13–2.01 2536 78.4 ** 1.54 1.34–1.75
Type of workplace           
Small kitchen 314 66.6   1   3184 73.4   1  
Medium kitchen (<1500 meals) 78 70.5 * 1.20 0.70–2.06 355 75.2 * 1.10 0.85–1.42
Large kitchen (1500 meals) 606 75.4   1.54 1.14–2.08 1242 77.8   1.27 1.08–1.60
Workplace environment factors           
Kitchen environment           
State of drainage           
Good 304 67.1   1   1760 71.5   1  
Poor 684 74.6 * 1.43 1.06–1.92 2907 76.5 ** 1.29 1.23–1.46
Slippery places on the floor           
No 340 62.6   1   2267 69.9   1  
Yes 637 77.7 ** 2.05 1.53–2.74 2399 78.9 ** 1.60 1.40–1.83
Bumps on the floor           
No 598 68.7   1   2872 72.1   1  
Yes 377 78.2 ** 1.62 1.02–2.19 1810 78.4 ** 1.39 1.22–1.61
Obstacles on the floor           
No 565 69.0   1   3063 73.5   1  
Yes 412 77.2 ** 1.51 1.13–2.02 1599 77.0 * 1.20 1.04–1.38
Noise level           
Quiet 583 69.5   1   2438 71.1   1  
Noisy 404 76.0 * 1.41 1.06–1.88 2249 78.6 ** 1.49 1.31–1.71
Height of cooking equipment           
Counter-tables           
Fit 568 68.0   1   3467 72.3   1  
High or low 420 78.1 ** 1.66 1.24–2.24 1242 80.9 ** 1.62 1.38–1.90
Kitchen sinks           
Fit 392 67.3   1   2432 68.5   1  
High or low 603 75.5 ** 1.45 1.09–1.93 2274 81.2 ** 2.00 1.74–2.29
Cauldrons           
Fit 772 68.9   1   3717 73.0   1  
High or low 209 85.6 ** 2.65 1.75–4.03 950 80.8 ** 1.55 1.30–1.85
Peelers           
Fit 685 70.4   1   3191 72.1   1  
High or low 254 77.6 * 1.44 1.03–2.02 1189 81.1 ** 1.64 1.39–1.94
Tableware washing machines – feeding           
Fit 776 70.6   1   3329 73.8   1  
High or low 193 79.8 * 1.60 1.09–2.36 1071 78.7 ** 1.31 1.11–1.55
Tableware washing machines – finishing           
Fit 694 69.2   1   3013 73.1   1  
High or low 271 81.2 ** 1.89 1.34–2.67 1379 79.0 ** 1.38 1.19–1.61
  1. 1) Chi-square test was conducted among men and women for each item. *p < 0.05, **p < 0.01.
  2. 2) Prevalence ratio was adjusted for age group.