| Academic school | Co-academic | Commercial | Technical | Total | p-value | |
| (n = 945) | (n = 123) | (n = 62) | (n = 57) | |||
| Frequency (%) | ||||||
| Usage | ||||||
| Yes | 509 (53.9) | 66 (53.7) | 36 (58.1) | 47 (82.5) | 658 | 0.0003 |
| No | 426 (45.1) | 56 (45.5) | 25 (40.3) | 7 (12.3) | 514 | |
| Missed | 10 (1.1) | 1 (0.8) | 1 (1.6) | 3 (5.30) | 15 | |
| Types of cosmetics used that contain | ||||||
| Cortico. compounds | 43 (4.6) | 6 (4.9) | 6 (9.7) | 12 (21.1) | 67 | <0.0001 |
| Mercuric compounds | 154 (16.3) | 22 (17.9) | 8 (12.9) | 3 (5.3) | 187 | |
| Hydroquinone | 17 (1.8) | 4 (3.3) | 1 (1.6) | 0 (0.0) | 22 | |
| Corti + mercury | 69 (7.3) | 2 (1.6) | 5 (8.1) | 14 (24.6) | 90 | |
| Corti + hydroquinone | 12 (1.3) | 0 (0.0) | 1 (1.6) | 5 (8.8) | 18 | |
| Mercury + hydro | 43 (4.6) | 8 (6.5) | 1 (1.6) | 1 (1.8) | 53 | |
| Three components | 50 (5.3) | 16 (13.0) | 5 (8.1) | 2 (3.5) | 73 | |
| Others | 100 (10.6) | 6 (4.9) | 7 (11.3) | 13 (22.8) | 126 | |
| Missed | 326 (34.5) | 58 (47.2) | 28 (45.2) | 7 (12.3) | 419 | |
| Duration of use (year) | ||||||
| 0 - 1 | 332 (35.1) | 46 (37.4) | 25 (40.3) | 35 (61.4) | 438 | 0.07 |
| 1 - 2 | 102 (10.8) | 11 (8.9) | 7 (11.3) | 10 (17.5) | 130 | |
| 2 - 3 | 33 (3.5) | 7 (5.7) | 2 (3.2) | 3 (5.3) | 45 | |
| 3 and over | 45 (4.8) | 2 (1.6) | 2 (3.2) | 0 (0.0) | 49 | |
| Missed | 319 (33.8) | 57 (46.3) | 26 (41.9) | 10 (17.5) | 412 | |
| Time of use (every) | ||||||
| Day | 319 (33.8) | 33 (26.8) | 24 (38.7) | 29 (50.9) | 405 | <0.0001 |
| Weak | 87 (9.2) | 13 (10.6) | 5 (8.1) | 13 (22.8) | 118 | |
| Month | 35 (3.7) | 10 (8.1) | 2 (3.2) | 2 (3.5) | 49 | |
| Years | 172 (18.2) | 5 (4.1) | 2 (3.2) | 0 (0.0) | 179 | |
| Missed | 332 (35.1) | 1 (0.8) | 29 (46.8) | 13 (22.8) | 375 | |