Table 1.
Demographic and clinical characteristics of comparison control patients and those with rheumatoid arthritis
| Variables | Comparison control (n = 27) |
Rheumatoid arthritis (n = 27) |
t | P | ||
|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | |||
| Age (yr) | 60.4 | 10.2 | 59.9 | 11.1 | 0.19 | 0.85 |
| Educational level (yr) | 16.1 | 3.1 | 15.1 | 5.1 | 1.17 | 0.25 |
| Income ($k/yr) | 66.1 | 51.6 | 64.5 | 48.9 | 0.13 | 0.90 |
| BMI | 25.4 | 5.0 | 27.2 | 4.6 | 1.31 | 0.20 |
| PSQI | 2.4 | 2.0 | 7.6 | 3.8 | 6.18 | < 0.001 |
| N | % | N | % | χ2 | P | |
| Sex (female) | 21 | 79 | 24 | 89 | 1.2 | 0.28 |
| Minority (non-Euro-American) | 9 | 33 | 16 | 59 | 3.7 | 0.06 |
| Marital status (married/partner) | 13 | 48 | 12 | 44 | 0.1 | 0.79 |
| Employment status (employed) | 13 | 48 | 8 | 30 | 1.9 | 0.16 |
BMI, body mass index; PSQI, Pittsburgh Sleep Quality Index; SD, standard deviation.