Table 1.
Demographic data, covariates, and pneumonia prevalence.
| Items | Sample Size, n (%) a |
|---|---|
| Total | 5640 (100.0) |
| Sex | |
| Boys | 2906 (52.3) |
| Girls | 2650 (47.7) |
| Age | |
| 3-year-olds | 945 (16.9) |
| 4-year-olds | 1862 (33.2) |
| 5-year-olds | 1866 (33.3) |
| 6-year-olds | 931 (16.6) |
| Residence-located area | |
| Tianqiao district | 1724 (30.6) |
| Shizhong district | 1688 (29.9) |
| Lixia district | 896 (15.9) |
| Zouchen city | 1332 (23.6) |
| Family history of atopy | |
| Yes | 524 (9.4) |
| No | 5076 (90.6) |
| Residence ownership | |
| Owner | 3971 (72.2) |
| Renter | 1532 (27.8) |
| Breastfeeding duration | |
| ≤6 months | 1057 (19.1) |
| >6 months | 4472 (80.9) |
| Household dampness-related exposure | |
| Yes | 4515 (81.2) |
| No | 1047 (18.8) |
| Household environmental tobacco smoke (ETS) | |
| Yes | 2892 (52.0) |
| No | 2670 (48.0) |
| Household renovation during early lifetime | |
| Yes | 1703 (31.8) |
| No | 3646 (68.2) |
| The child’s bedroom floor level | |
| 1st–3rd floors | 2723 (50.9) |
| 4th–6th floors | 2040 (38.1) |
| ≥7th floors | 586 (11.0) |
| Frequency of opening bedroom windows during night | |
| Often | 3950 (71.7) |
| Not often | 1559 (28.3) |
| Pneumonia prevalence | |
| Yes | 1429 (25.9) |
| No | 4092 (74.1) |
a Due to missing data, sample sums in some items could be smaller than the total number.