Table 2: Multinomial logistic regression analysis for prevalence of skin allergies in adolescents in Namibia.
| Skin allergy typea | Factor | Log (OR) | Standard error | Wald | Degrees of freedom | p-value | OR | 95% Confidence interval of OR |
| Atopic dermatitis | Intercept | -0.669 | 0.838 | 0.637 | 1 | 0.425 | - | - |
| Gender Male |
-0.383 |
0.484 |
0.625 |
1 |
0.429 |
0.682 |
0.264, 1.762 |
|
| Female | 0b | - | - | 0 | - | - | - | |
| Age group 15-17 |
-0.172 |
0.799 |
0.047 |
1 |
0.829 |
0.842 |
0.176, 4.027 |
|
| 18-20 | 0.208 | 0.844 | 0.061 | 1 | 0.805 | 1.232 | 0.235, 6.442 | |
| 21-23 | -0.034 | 0.749 | 0.002 | 1 | 0.964 | 0.966 | 0.223, 4.191 | |
| 24-26 | -.227 | 0.709 | 0.102 | 1 | 0.749 | 0.797 | 0.198, 3.202 | |
| 27-30 | 0b | - | - | 0 | - | - | - | |
| Occupation Labour work |
2.005 |
0.856 |
5.481 |
1 |
0.019 |
7.427 |
1.386, 39.794 |
|
| Office work | 2.519 | 0.869 | 8.397 | 1 | 0.004 | 12.411 | 2.259, 68.175 | |
| Students | 2.754 | 0.804 | 11.727 | 1 | 0.001 | 15.713 | 3.248, 76.017 | |
| Others | 0b | - | - | 0 | - | - | - | |
| Possible causes Medication |
-0.188 |
1.042 |
0.033 |
1 |
0.856 |
0.828 |
0.108, 6.380 |
|
| Weather change | -1.629 | 0.499 | 10.634 | 1 | 0.001 | 0.196 | 0.074, 0.522 | |
| Others | 0b | - | - | 0 | - | - | - | |
| Contact dermatitis | Intercept | -0.535 | 0.797 | 0.451 | 1 | 0.502 | - | - |
| Gender Male |
0.477 |
0.504 |
0.894 |
1 |
0.344 |
1.610 |
0.600, 4.325 |
|
| Female | 0b | - | - | 0 | - | - | - | |
| Age group 15-17 |
-0.798 |
0.883 |
0.817 |
1 |
0.366 |
0.450 |
0.080, 2.541 |
|
| 18-20 | -0.460 | 0.919 | 0.251 | 1 | 0.616 | 0.631 | 0.104, 3.819 | |
| 21-23 | -0.222 | 0.783 | 0.080 | 1 | 0.777 | 0.801 | 0.173, 3.717 | |
| 24-26 | -0.068 | 0.713 | 0.009 | 1 | 0.924 | 0.934 | 0.231, 3.781 | |
| 27-30 | 0b | - | - | 0 | - | - | - | |
| Occupation Manual labour |
1.863 |
0.827 |
5.083 |
1 |
0.024 |
6.446 |
1.276, 32.571 |
|
| Office work | 1.955 | 0.854 | 5.244 | 1 | 0.022 | 7.062 | 1.325, 37.631 | |
| Students | 1.988 | 0.811 | 6.008 | 1 | 0.014 | 7.301 | 1.489, 35.791 | |
| Others | 0b | - | - | 0 | - | - | - | |
| Possible causes Medication |
-0.304 |
1.032 |
0.087 |
1 |
0.768 |
0.738 |
0.098, 5.576 |
|
| Weather change | -2.105 | 0.558 | 14.252 | 1 | 0.000 | 0.122 | 0.041, 0.363 | |
| Others | 0b | - | - | 0 | - | - | - |
aThe reference category for the skin allergy type dependent variable is: Others; bThese parameters are set to zero because they are redundant as these factor categories were chosen to be the reference categories.