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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)