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Table 2 Characteristics of cases and controls

From: Association between occupation and knee and hip replacement due to osteoarthritis: a case-control study

  THR only
n = 896
TKR only
n = 400
THR and TKR
n = 112
Controls
n = 1082
Sex, n (%)     
   Men 399 (69.3) 134 (23.3) 43 (7.5) 490
   Women 497 (59.7) 266 (32.0) 69 (8.3) 592
Age, mean (SD) years     
   Men 74.7 (7.4) 73.9 (6.5) 74.2 (6.5) 71.0 (7.0)
   Women 74.9 (7.8) 73.5 (7.2) 74.3 (8.1) 70.5 (7.1)
BMI, mean (SD) kg/m2     
   Men 26.0 (3.2) 26.6 (3.2) 26.8 (3.1) 25.4 (2.9)
   Women 25.2 (4.2) 27.0 (4.4) 26.3 (3.1) 25.2 (3.5)
Occupation, n (%)     
   Managers and professionals     
Men 27 (6.8) 7 (5.2) 3 (7.0) 59 (12.0)
Women 46 (9.3) 15 (5.6) 6 (8.7) 48 (8.1)
   Technicians and clerks     
Men 39 (9.8) 11 (8.2) 1 (2.3) 60 (12.2)
Women 67 (13.5) 27 (10.2) 7 (10.1) 95 (16.0)
   Service and shop workers     
Men 28 (7.0) 5 (3.7) 3 (7.0) 30 (6.1)
Women 89 (17.9) 43 (16.2) 8 (11.6) 106 (17.9)
   Farmers     
Men 140 (35.1) 43 (32.1) 10 (23.3) 83 (16.9)
Women 77 (15.5) 52 (19.5) 18 (26.1) 95 (16.0)
   Fishermen     
Men 36 (9.0) 25 (18.7) 14 (32.6) 62 (12.7)
Women 0 (0) 0 (0) 0 (0) 0 (0)
   Craft workers     
Men 78 (19.5) 30 (22.4) 6 (14.0) 122 (24.9)
Women 69 (13.9) 40 (15.0) 5 (7.2) 82 (13.9)
   Operators and unskilled labour     
Men 51 (12.8) 13 (9.7) 6 (14.0) 74 (15.1)
Women 46 (9.3) 35 (13.2) 11 (15.9) 70 (11.8)
   Housewives     
Men 0 (0) 0 (0) 0 (0) 0 (0)
Women 103 (20.7) 54 (20.3) 14 (20.3) 96 (16.2)
  1. THR: total hip replacement; TKR: total knee replacement