Table 2.
Sample characteristics and the prevalence of asthma by parental socio-demographic characteristics and living conditions
| Characteristics | No. (%) | Prevalence of asthma (%) | P* |
|---|---|---|---|
| Maternal age at childbirth (years): | 0.608 | ||
| <20 | 49 (3.3) | 14.3 | |
| 20-24 | 633 (43.2) | 6.8 | |
| 25-29 | 441 (30.1) | 5.9 | |
| ≥30 | 275 (18.8) | 8.7 | |
| unknown | 66 (4.5) | 12.1 | |
| Maternal occupation: | 0.093 | ||
| blue-collar worker | 133 (9.1) | 3.0 | |
| white-collar worker | 715 (48.8) | 7.3 | |
| out of work | 616 (42.1) | 8.4 | |
| Paternal age at childbirth (years): | 0.788 | ||
| <25 | 534 (36.5) | 7.5 | |
| 25-29 | 423 (28.9) | 5.4 | |
| ≥30 | 421 (28.8) | 7.6 | |
| unknown | 86 (5.9) | 15.1 | |
| Paternal occupation: | 0.227 | ||
| blue-collar worker | 253 (17.3) | 7.9 | |
| white-collar worker | 696 (47.5) | 6.2 | |
| out of work | 515 (35.2) | 8.7 | |
| Monthly income per person (roubles): | 0.271 | ||
| <1000 | 128 (8.7) | 7.8 | |
| 1000-2999 | 1 080 (73.8) | 6.8 | |
| ≥3000 | 256 (17.5) | 9.8 | |
| Smoking in the family: | 0.739 | ||
| no | 723 (49.4) | 7.6 | |
| yes | 741 (50.6) | 7.2 | |
| Family situation: | 0.001 | ||
| complete family | 1 295 (88.5) | 6.6 | |
| incomplete family | 169 (11.5) | 13.6 | |
| Type of housing: | 0.647 | ||
| separate apartment | 1 377 (94.1) | 7.3 | |
| room in a hostel/municipal flat | 87 (5.9) | 9.2 | |
| Living area per person (m2): | 0.504 | ||
| <6 | 174 (11.9) | 8.6 | |
| ≥6 | 1 290 (88.1) | 7.2 | |
| Presence of pets: | 0.014 | ||
| no | 595 (40.6) | 9.4 | |
| yes | 869 (59.4) | 6.0 | |
| Presence of carpets: | <0.001 | ||
| no | 179 (12.2) | 15.6 | |
| yes | 1 285 (87.8) | 6.2 | |
| Presence of down pillows or blankets: | 0.021 | ||
| no | 260 (17.8) | 10.8 | |
| yes | 1 204 (82.2) | 6.6 | |
| Distance to a highway (m): | 0.678 | ||
| <15 | 733 (50.1) | 7.1 | |
| ≥15 | 731 (49.9) | 7.7 | |
| Distance to an industrial plant (m): | 0.222 | ||
| <300 | 337 (23.0) | 8.9 | |
| ≥300 | 1 127 (77.0) | 6.9 |
*Pearson χ2 test.