Table 2 Arthritis prevalence, kappa and percent agreement for those asked Questionnaire 1 and 2 at two different times
|  | Overall prevalence (%) | Prevalence Ques 1 (%) | Prevalence Ques 2 (%) | Ques 1 time 1 and 2 (N =52) |  |  | Ques 2 time 1 and 2 (N =51) |  |  |
|---|---|---|---|---|---|---|---|---|---|
Arthritis | N =203 | N =102 | N =101 | % agreement | % expected agreement | kappa | % agreement | % expected agreement | kappa |
Osteoarthritis | 21.7 | 22.5 | 20.8 | 92.3 | 73.9 | 0.71 | 94.1 | 67.3 | 0.82 |
Rheumatoid arthritis | 1.5 | 1.0 | 2.0 | 100.0 | - | 1.00 | 100.0 | - | 1.0 |
Other type arthritis | 2.5 | 3.9 | 1.0 | 98.1 | 94.4 | 0.66 | 100.0 | - | 1.0 |
Don’t know type | 14.3 | 14.7 | 13.9 | 86.5 | 65.5 | 0.61 | 88.2 | 76.0 | 0.51 |
No arthritis | 61.1 | 57.8 | 64.4 | 88.5 | 51.2 | 0.76 | 90.2 | 53.3 | 0.79 |
Arthritis overall | 38.9 | 42.2 | 35.6 | 92.0 | 51.2 | 0.84 | 90.2 | 53.3 | 0.79 |