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Table 3 Distribution of persistent complaints in different parts of the body of sewers , prevalence proportion ratio (PPR) and 95% confidence interval (CI), compared with joint group (n = 300)

From: The effects of a medical hypnotherapy on clothing industry employees suffering from chronic pain

  Sewers* (n = 300) Reference groups (length of service, years)
I (0–7) (n = 150) II (8–15) (n = 90) III (> 15) (n = 60)
Number % Number % Number % Number %
PPR (95% CI) PPR (95% CI) PPR (95% CI)
Neck 107 35.7 24 16.0 72 80.0 11 18.3
0.45 (0.38-0.52) 2.24 (1.78-2.70) 0.51 (0.40-0.61)
Shoulder 130 43.3 46 30.6 67 74.4 17 28.3
0.71 (0.59-0.82) 1.72 (1.36-2.07) 0.65 (0.51-0.78)
Elbow 28 9.3 4 2.6 14 15.5 10 16.6
0.28 (0.23-0.32) 1.66 (1.31-2.00) 1.78 (1.41-2.15)
Wrist/hands 65 21.6 11 7.3 39 43.3 15 25.0
0.34 (0.28-0.39) 1.99 (1.57-2.40) 2.98 (2.36-3.59)
Upper back 35 11.7 0 0 27 30.0 8 13.3
0   2.57 (2.04-3.10) 2.14 (1.70-2.58)
Low back 17 5.7 1 0.6 10 11.1 6 10.0
0.12 (0.10-0.14) 1.95 (1.54-2.35) 2.35 (1.86-2.83)
Hip/Thigh 10 3.3 0 0 3 3.3 7 11.6
0   1.00 (0.79-1.20) 3.00 (2.38-3.62)
Knee 5 1.6 0 0 2 2.2 3 5.0
0   1.33 (1.05-1.60) 3.00 (2.38-3.62)
Ankle/Shank/Feet 7 2.3 2 1.3 2 2.2 3 5.0
0.57 (0.48-0.66) 0.95 (0.75-1.14) 2.14 (1.70-2.58)
  1. * Multiple answers were possible.