Table I.
Distribution of selected characteristics between patients with OPLs and control participants
| Variables | OPL patients (n = 143) | Controls (n = 357) | P a |
|---|---|---|---|
| Age, mean (SD) | 57.3 (12.4) | 58.5 (11.4) | 0.300 |
| Sex, n (%) | |||
| Male | 87 (60.8) | 215 (60.2) | |
| Female | 56 (39.2) | 142 (39.8) | 0.899 |
| Race, n (%) | |||
| Caucasians | 126 (88.1) | 323 (90.5) | |
| Others | 17 (11.9) | 34 (9.5) | 0.430 |
| Black | 2 (1.4) | 11 (3.1) | |
| Hispanic | 7 (4.9) | 17 (4.8) | |
| Unknown | 8 (5.6) | 6 (1.7) | |
| Smoking status, n (%) | |||
| Never | 60 (42.0) | 182 (51.0) | |
| Former | 48 (33.6) | 136 (38.1) | |
| Current | 35 (24.5) | 39 (10.9) | <0.001 |
| Ever | |||
| Former and current | 83 (58.0) | 175 (49.0) | 0.068 |
| Alcohol consumption, n (%) | |||
| Never | 53 (37.1) | 249 (69.7) | |
| Ever | 85 (59.4) | 108 (30.3) | <0.001 |
| Unknown | 5 (3.5) | ||
| Histology grade of OPLs, n (%) | |||
| Hyperkeratosis | 14 (9.8) | ||
| Hyperplasia | 23 (16.1) | ||
| Mild dysplasia | 55 (38.5) | ||
| Moderate dysplasia | 26 (18.2) | ||
| Severe dysplasia | 12 (8.4) | ||
| Carcinoma in situ | 13 (9.1) | ||
a P value was determined by the Pearson χ2 test for sex, race, smoking status and alcohol consumption, and was determined by the Student’s t-test for age.