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Table 1 A summary of the demographic data for the sample (N = 923), and the coding categories included in the Rasch analysis for each person variable [9] 

From: Rasch analysis of the brief Michigan Hand Questionnaire in patients with thumb osteoarthritis

Person variable

Coding categories

Number of persons (% of total sample N = 923)

Sex

Male

204 (22%)

Female

719 (78%)

Age

Under 40

8 (1%)

40 – 49 years

64 (7%)

50 – 59 years

379 (41%)

60 – 69 years

355 (38%)

70 – 79 years

110 (12%)

80 – 89 years

7 (1%)

Dominant hand treated

No

416 (45%)

Yes

409 (44%)

Ambidexter, one hand treated

30 (3%)

Ambidexter, both hands treated

4 (0.4%)

Both hands treated, not ambidexter

64 (7%)

Treatment choice

Non-surgical

579 (63%)

Surgical

344 (37%)

Pain Catastrophizing Scale (0 – 52) [12]

Less than 15

589 (64%)

15 – 23

199 (21.5%)

24 – 38

121 (13%)

39—52

14 (1.5%)

Illness perception overall score (0 – 80) [13]

0—10

7 (1%)

11—20

37 (4%)

21 – 30

110 (12%)

31 -40

280 (30%)

41 – 50

352 (38%)

51 – 60

123 (13%)

61 – 70

14 (2%)

71 – 80

0 (0%)

Type of work

Unemployed

391 (42%)

Light physical labor

194 (21%)

Moderate physical labor

240 (26%)

Heavy physical labor

98 (11%)