Table 4 Difference Test of Frequency of Stimulation Symptoms before and after Matching.
| Â | Â | Before matching | After matching | ||||||
|---|---|---|---|---|---|---|---|---|---|
Low exposure | High exposure | χ2 | P | Low exposure | High exposure | χ2 | P | ||
Red swelling and fever of the skin | Â | Â | Â | 3.155 | 0.368 | Â | Â | 3.201 | 0.362 |
| Â | Nothing | 809 | 315 | Â | Â | 329 | 315 | Â | Â |
| Â | Light | 128 | 54 | Â | Â | 46 | 54 | Â | Â |
| Â | Middle | 38 | 23 | Â | Â | 16 | 23 | Â | Â |
| Â | High | 1 | 0 | Â | Â | 1 | 0 | Â | Â |
Eye pruritus | Â | Â | Â | 15.102 | 0.001 | Â | Â | 8.038 | 0.018 |
| Â | Nothing | 777 | 279 | Â | Â | 313 | 279 | Â | Â |
| Â | Light | 140 | 68 | Â | Â | 49 | 68 | Â | Â |
| Â | Middle | 59 | 45 | Â | Â | 30 | 45 | Â | Â |
Unexplained sneezing and runny nose | Â | Â | Â | 7.141 | 0.028 | Â | Â | 8.165 | 0.017 |
| Â | Nothing | 732 | 274 | Â | Â | 294 | 274 | Â | Â |
| Â | Light | 205 | 90 | Â | Â | 87 | 90 | Â | Â |
| Â | Middle | 39 | 28 | Â | Â | 11 | 28 | Â | Â |
Asthma | Â | Â | Â | 3.01 | 0.222 | Â | Â | 2.18 | 0.336 |
| Â | Nothing | 921 | 360 | Â | Â | 370 | 360 | Â | Â |
| Â | Light | 40 | 23 | Â | Â | 17 | 23 | Â | Â |
| Â | Middle | 15 | 9 | Â | Â | 5 | 9 | Â | Â |
