| |
Group A
(n = 20) |
Group B
(n = 20) |
Group C
(n=20) |
Total |
| No. |
% |
No. |
% |
No. |
% |
No. |
% |
| Predisposing factors |
|
|
|
|
|
|
|
|
| UVR |
11 |
55.0 |
13 |
65.0 |
7 |
35.0 |
31 |
51.7 |
| χ2 (p) |
3.737 (0.154) |
|
|
| Pregnancy |
11 |
55.0 |
6 |
30.0 |
9 |
45.0 |
26 |
43.3 |
| χ2(p) |
2.579 (0.275) |
|
|
| Hormonal |
10 |
50.0 |
12 |
60.0 |
12 |
60.0 |
34 |
56.7 |
| χ2(p) |
0.543 (0.762) |
|
|
| Cosmetic |
4 |
20.0 |
3 |
15.0 |
3 |
15.0 |
10 |
16.7 |
| χ2(MCp) |
0.240 (1.000) |
|
|
| Family history |
6 |
30.0 |
6 |
30.0 |
8 |
40.0 |
20 |
33.3 |
| χ2 |
0.600 (0.741) |
|
|
| Fitzpatrick skin type |
|
|
|
|
|
|
|
|
| III |
5 |
25.0 |
5 |
25.0 |
8 |
40.0 |
18 |
30.0 |
| IV |
14 |
70.0 |
14 |
70.0 |
8 |
40.0 |
36 |
60.0 |
| V |
1 |
5.0 |
1 |
5.0 |
4 |
20.0 |
6 |
10.0 |
| KWc2(p) |
0.047 (0.977) |
|
|
| Pattern of melasma |
|
|
|
|
|
|
|
|
| Centrofacial |
16 |
80.0 |
14 |
70.0 |
16 |
80.0 |
46 |
76.7 |
| Malar |
3 |
15.0 |
4 |
20.0 |
3 |
15.0 |
10 |
16.7 |
| Mandibular |
1 |
5.0 |
2 |
10.0 |
1 |
5.0 |
4 |
6.7 |
| χ2 (MCp) |
0.874 (0.922) |
|
|
| Wood `s light |
|
|
|
|
|
|
|
|
| Epidermal |
8 |
40.0 |
9 |
45.0 |
13 |
65.0 |
30 |
50.0 |
| Dermal |
7 |
35.0 |
4 |
20.0 |
2 |
10.0 |
13 |
21.7 |
| Mixed |
5 |
25.0 |
7 |
35.0 |
5 |
25.0 |
17 |
28.3 |
| χ2(MCp) |
4.794 (0.337) |
|
|
|
