Table I.
Population demographics and acne characteristics
| F+T group |
F group |
|
|---|---|---|
| N = 694 | N = 615 | |
| Age (years), mean (95% CI) | 18.71 (17.3-20.1) | 18.50 (17.8-19.2) |
| Age <16 years, n (%) | 288 (46.8%) | 333 (48.0%) |
| Sex, n (%) | ||
| Males | 385 (55.5%) | 349 (56.8%) |
| Females | 309 (44.5%) | 266 (43.2%) |
| Type of residence, n (%) | ||
| Urban | 412 (59.4%) | 364 (59.2%) |
| Suburban | 201 (29.0%) | 182 (29.7%) |
| Rural | 80 (11.6%) | 69 (11.1%) |
| Country, n (%) | ||
| United States | 323 (46.6%) | 293 (47.6%) |
| Canada | 33 (4.7%) | 45 (7.2%) |
| Brazil | 82 (11.9%) | 86 (13.9%) |
| Germany | 80 (11.6%) | 60 (9.7%) |
| France | 121 (17.4%) | 79 (12.9%) |
| Italy | 53 (7.7%) | 53 (8.6%) |
| Clinical characteristics of acne | ||
| Family history, n (%) | ||
| Yes∗ | 581 (85.4%) | 462 (78.0%) |
| Age at onset, mean (95% CI) | ||
| Facial acne∗ | 12.6 (12.3-13.0) | 13.1 (12.8-13.5) |
| Truncal acne | 13.1 (12.7-13.5) | NA |
| Acne duration at time of survey completion (years), mean (95% CI) | ||
| Facial acne | 6.1 (4.5-7.7) | 5.5 (4.4-6.5) |
| Truncal acne | 5.6 (4.3-6.8) | NA |
| Current acne severity: Face, n | 694 | 615 |
| Almost clear | 0 | 0 |
| Mild | 312 (45.0%) | 310 (50.4%) |
| Moderate | 249 (35.9%) | 240 (39.1%) |
| Severe | 113 (16.2%) | 57 (9.3%) |
| Very severe | 20 (2.9%) | 8 (1.3%) |
| Current acne severity: Back, n | 644 | 0 |
| Almost clear | 7 (1.0%) | |
| Mild | 208 (32.0%) | |
| Moderate | 287 (44.5%) | |
| Severe | 119 (18.4%) | |
| Very severe | 24 (3.7%) | |
| Current acne severity: Chest, n | 317 | 0 |
| Almost clear | 46 (14.7%) | |
| Mild | 123 (38.7%) | |
| Moderate | 91 (28.8%) | |
| Severe | 48 (15.3%) | |
| Very severe | 8 (2.6%) | |
F, Facial acne only group; F+T, facial and truncal acne group.
∗
P values for the comparison of F+T versus F groups significant at <.05.