Table 1.
Baseline characteristics of study participants according to patch test response (Yes/No) to the irritants (prevalent cases excluded)
| Variable | All subjects |
SLS, 2.5% | BKC, 0.5% | NaOH, 1% | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| N=90 | Yes N=63 |
NO N=26 |
p-value | Yes N=59 |
NO N=31 |
p-value | Yes N=62 |
NO N=15 |
p-value | |
| Age (%) | ||||||||||
| 20–30 | 55.4 | 49.1 | 68.0 | 0.4294 | 63.3 | 50.9 | 0.4436 | 69.2 | 50.0 | 0.3866 |
| 30–40 | 26.5 | 31.6 | 16.0 | 23.3 | 28.3 | 15.4 | 32.8 | |||
| 40–50 | 8.4 | 8.8 | 8.0 | 10.0 | 7.6 | 15.4 | 8.6 | |||
| ≥50 | 9.6 | 10.5 | 8.0 | 3.3 | 13.2 | 0.00 | 8.6 | |||
| Gender (%) | ||||||||||
| Male | 35.6 | 38.3 | 26.9 | 0.3079 | 32.3 | 37.5 | 0.6249 | 35.7 | 34.4 | 1.0000 |
| Female | 64.4 | 61.7 | 73.1 | 67.7 | 62.5 | 64.3 | 65.6 | |||
| Ethnicity (%) | ||||||||||
| Caucasian | 76.1 | 78.7 | 69.2 | 0.3453 | 80.7 | 73.7 | 0.4643 | 78.6 | 75.8 | 1.0000 |
| Other | 23.9 | 21.3 | 30.8 | 19.4 | 26.3 | 21.4 | 24.2 | |||
| Atopy (%) | ||||||||||
| Positive | 19.3 | 22.9 | 11.5 | 0.2191 | 32.3 | 12.3 | 0.0234 | 14.3 | 22.6 | 0.7208 |
| Negative | 80.7 | 77.1 | 88.5 | 67.7 | 87.7 | 85.7 | 77.4 | |||
| Season (%) | ||||||||||
| Warm | 55.6 | 52.4 | 65.4 | 0.2609 | 67.7 | 49.2 | 0.0917 | 73.3 | 53.2 | 0.1579 |
| Cold | 44.4 | 47.6 | 34.6 | 32.3 | 50.8 | 26.7 | 46.8 | |||
| Hand washing freq. (%) | ||||||||||
| <10/day | 55.8 | 57.6 | 50.0 | 0.5146 | 53.3 | 57.1 | 0.7346 | 42.9 | 55.9 | 0.3779 |
| ≥10/day | 44.2 | 42.4 | 50.0 | 46.7 | 42.9 | 57.1 | 44.1 | |||
| Age | 31.8 ± | 32.8 ± | 30.0 ± | 0.2277 | 29.8 ± | 32.9 ± | 0.1567 | 29.5 ± | 31.9 ± | 0.3761 |
| 9.6 | 9.2 | 10.4 | 8.4 | 10.1 | 9.1 | 8.7 | ||||
| Hand washing freq. | 11.9 ± | 12.0 ± | 11.8 ± | 0.8766 | 12.3 ± | 11.7 ± | 0.6619= | 11.4 ± | 12.4 ± | 0.5892 |
| 5.7 | 6.2 | 4.6 | 5.7 | 5.8 | 3.8 | 6.4 | ||||
| Sanitizer use (%) | ||||||||||
| Yes | 65.0 | 68.3 | 60.0 | 0.4603 | 60.0 | 67.9 | 0.4857 | 42.9 | 68.3 | 0.1211 |
| No | 35.0 | 31.7 | 40.0 | 40.0 | 32.1 | 57.1 | 31.7 | |||
| Glove use (%) | ||||||||||
| Yes | 82.0 | 82.3 | 80.8 | 0.8688 | 86.7 | 79.7 | 0.4159 | 80.0 | 81.9 | 0.8602 |
| No | 18.0 | 17.7 | 19.2 | 13.3 | 20.3 | 20.0 | 18.1 | |||
| Mean humidity * | 32.1 ± | 30.1 ± | 37.6 ± | 0.0154 | 35.1 ± | 30.5 ± | 0.1248 | 38.6 ± | 30.7 ± | 0.0397 |
| 13.5 | 12.2 | 15.3 | 14.0 | 13.1 | 16.3 | 12.6 | ||||
| Mean temperature * | 48.9 ± | 47.6 ± | 52.4 ± | 0.0091 | 50.3 ± | 48.2 ± | 0.2222 | 52.8 ± | 47.9 ± | 0.0268 |
| 7.9 | 7.1 | 8.9 | 7.9 | 7.9 | 8.4 | 7.4 | ||||
P-values compare the distribution of categorical covariates or mean values of continuous covariates by categories of the patch test result for each irritant; p-values are from chi-square test of independence or Fisher’s exact test for categorical covariates, and from t-test for continuous covariates.
*
Mean humidity and temperature data were obtained from the National Climatic Data Center and were not collected as part of the study protocol