Table 1. Descriptive Characteristics of the Study Population .
| Characteristic | Patients With Pemphigus (n = 1985) | Controls (n = 9874) | P Value |
|---|---|---|---|
| Age, y | |||
| Mean (SD) | 72.1 (18.5) | 72.1 (18.5) | >.99 |
| Median (range) | 77.4 (0-103.0) | 77.4 (0-103.1) | |
| Male sex, No. (%) | 797 (40.2) | 3962 (40.1) | .93 |
| Ethnicity, No. (%) | |||
| Jews | 1805 (90.9) | 8866 (89.8) | .14 |
| Arabs | 180 (9.1) | 1008 (10.2) | |
| Body mass index, mean (SD)a | 27.7 (6.6) | 27.9 (6.6) | .36 |
| Smoking, No. (%) | 510 (25.7) | 2758 (27.9) | .045 |
| Charlson comorbidity score, No. (%) | |||
| None (0) | 344 (17.3) | 2636 (26.7) | <.001 |
| Moderate (1-2) | 582 (29.3) | 3183 (32.2) | .01 |
| Severe (≥3) | 1059 (53.4) | 4055 (41.1) | <.001 |
| Health care use, No. (%) | |||
| 0 Visits | 286 (14.4) | 770 (7.8) | <.001 |
| 1-12 Visits | 411 (20.7) | 2094 (21.2) | .25 |
| ≥13 Visits | 1288 (64.9) | 7010 (71.0) | <.001 |
| Socioeconomic status, No. (%) | |||
| Low | 634 (31.9) | 3249 (32.9) | .39 |
| Intermediate | 830 (41.8) | 4263 (43.2) | .25 |
| High | 423 (21.3) | 2217 (22.5) | .24 |
a
Calculated as weight in kilograms divided by height in meters squared.