Table 3.
Skin Prick Test (SPT) results and self-reported allergic symptoms by study group.
| Group 1 (Baseline) | Group 2 | Group 3 | p Value for Equal Proportions | |
|---|---|---|---|---|
| Plancha Installation Age | (<6 Months) | (~18 Months) | (~57 Months) | |
| Number of Cases (%) | Number of Cases (%) | Number of Cases (%) | ||
| Positive SPT result | n = 184 | n = 187 | n = 155 | |
| D. farinae | 29 (15.8%) | 25 (13.4%) | 17 (11.0%) | 0.44 |
| D. pteronyssinus | 9 (4.9%) | 11 (5.9%) | 9 (5.8%) | 0.90 |
| Cockroach | 70 (38.0%) | 69 (36.9%) | 56 (36.1%) | 0.93 |
| Dog | 1 (0.5%) | 6 (3.2%) | 2 (1.3%) | 0.13 |
| Cat | 5 (2.7%) | 4 (2.1%) | 3 (1.9%) | 0.88 |
| Ragweed | 1 (0.5%) | 1 (0.5%) | 0 (0%) | 0.66 |
| Maternal-reported allergic symptoms | n = 188 | n = 192 | n = 157 | |
| Asthma symptoms | ||||
| Any wheezing episode | 13 (6.9%) | 12 (6.2%) | 29 (18.5%) | <0.001 |
| Exercise-induced wheezing | 8 (4.3%) | 6 (3.1%) | 9 (5.7%) | 0.49 |
| Cough | 54 (28.7%) | 40 (20.8%) | 60 (38.2%) | <0.01 |
| Rhinitis symptoms | ||||
| Sneezing, congestion, or rhinorrhea | 33 (17.6%) | 47 (24.5%) | 54 (34.4%) | <0.01 |
| Allergic conjunctivitis symptoms | ||||
| Itchy or watery eyes | 33 (17.6%) | 26 (13.5%) | 27 (17.2%) | 0.21 |
| Eczema symptoms | 24 (12.8%) | 25 (13.0%) | 22 (14.0%) | 0.94 |
Note: n indicates the number of children in each group with valid SPT results or maternal-reported allergic symptoms in each group.