Sociodemographic and clinical characteristics of study participants in the case–control study
| Cases (n=18) | Controls (n=121) | p Value* | |
|---|---|---|---|
| Cause for visit | <0.01 | ||
| Pulmonology | 18 (100%) | 55 (45.5%) | |
| Allergy | 0 (0%) | 30 (24.8%) | |
| Obstetric gynaecology | 0 (0%) | 36 (29.8%) | |
| Age | 0.62 | ||
| 20s | 1 (5.6%) | 17 (14.0%) | |
| 30s | 13 (72.2%) | 65 (53.7%) | |
| 40s | 4 (22.2%) | 35 (28.9%) | |
| 50s | 0 (0%) | 4 (3.3%) | |
| Mean±SD | 36.8±5.1 | 36.5±6.8 | 0.86 |
| Sex | 0.72 | ||
| Women | 15 (83.3%) | 104 (86.0%) | |
| Men | 3 (16.7%) | 17 (14.0%) | |
| Marital status | 0.40 | ||
| Not married | 1 (5.6%) | 22 (18.2%) | |
| Married | 17 (94.4%) | 98 (81.0%) | |
| Unknown | 0 (0%) | 1 (0.8%) | |
| Children | 0.01 | ||
| None | 2 (11.1%) | 34 (28.1%) | |
| One or more | 16 (88.9%) | 64 (52.9%) | |
| Unknown | 0 (0%) | 23 (19.0%) | |
| Smoking status | 0.06 | ||
| Non-smoker | 14 (77.8%) | 104 (86.0%) | |
| Ex-smoker | 4 (22.2%) | 8 (6.6%) | |
| Current smoker | 0 (0%) | 9 (7.4%) | |
| Past medical history | |||
| Atopic dermatitis | 0 (0%) | 3 (2.5%) | 1.00 |
| Asthma | 2 (11.1%) | 14 (11.6%) | 1.00 |
| Allergy | 3 (16.7%) | 16 (13.2%) | 0.71 |
| Respiratory disease | 0 (0%) | 20 (16.5%) | 0.07 |
| Others | 2 (11.1%) | 20 (16.5%) | 0.74 |
*p Values were calculated by using the χ2 test or Student t test depending on the nature of the variable.