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Table 2 Characteristics of respondents in the item calibration study (N = 888)

From: Assessment of health-related quality of life in arthritis: conceptualization and development of five item banks using item response theory

  Community sample with arthritis (N = 217) n (%) Rheumatology clinic (N = 331) n (%) Joint replacement waiting list (N = 340) n (%)
Age    
0–24 0 (0.0) 5 (1.5) 4 (1.2)
25–44 23 (10.6) 71 (21.5) 28 (8.2)
45–64 83 (38.2) 160 (48.3) 133 (39.1)
65+ 108 (49.8) 84 (25.4) 166 (48.8)
Missing 3 (1.4) 11 (3.3) 9 (2.7)
Sex    
Males 69 (31.8) 69 (20.9) 150 (44.1)
Females 147 (67.7) 250 (75.5) 179 (52.7)
Missing 1 (0.5) 12 (3.6) 11 (3.2)
Education    
Less than high school 50 (23.0) 61 (18.4) 81 (23.8)
High school completed 94 (43.3) 146 (44.1) 133 (39.1)
Trade school/college/university 72 (33.2) 113 (34.1) 115 (33.8)
Missing 1 (0.5) 11 (3.3) 11 (3.2)
Self-reported co-morbidity 1    
Back pain 101 (46.5) 106 (32.0) 135 (39.7)
Heart disease 33 (15.2) 30 (9.1) 38 (11.2)
Lung disease 10 (4.6) 35 (10.6) 5 (1.5)
Diabetes 15 (6.9) 26 (7.9) 17 (5.0)
Depression 20 (9.2) 36 (10.9) 30 (8.8)
Other2 147 (67.7) 237 (71.6) 227 (66.8)
Self-rated health    
Excellent 8 (3.7) 5 (1.5) 26 (7.7)
Very good 57 (26.3) 40 (12.1) 98 (28.8)
Good 87 (40.1) 103 (31.1) 126 (37.1)
Fair 52 (24.0) 135 (40.8) 77 (22.7)
Poor 12 (5.5) 46 (13.9) 12 (3.5)
Missing 1 (0.5) 2 (0.6) 1 (0.3)
  1. 1Cell counts do not sum to the sample size because a person may have multiple co-morbidities
  2. 2 Includes: high blood pressure; ulcer or stomach disease; kidney disease; liver disease; anemia or blood disease; cancer; other medical problem (excluding OA and RA)