Table 2 Bivariate association between Seasonal ventilation frequency and cognitive function
Seasonal ventilation frequency | Cognitive function a, Count (%) | P-value b | |
|---|---|---|---|
Normal N = 8818 (74.4) | Impaired N = 3035 (25.6) | ||
Spring ventilation frequency |  |  | < 0.001 |
0 time/week | 358 (4.1) | 242 (8.0) | Â |
1–5 times/week | 3521 (39.9) | 1190 (39.2) |  |
> 5 times/week | 4939 (56.0) | 1603 (52.8) |  |
Summer ventilation frequency |  |  | < 0.001 |
0 time/week | 198 (2.3) | 140 (4.6) | Â |
1–5 times/week | 1847 (21.0) | 691 (22.8) |  |
> 5 times/week | 6773 (76.8) | 2204 (72.6) |  |
Autumn ventilation frequency |  |  | < 0.001 |
0 time/week | 315 (3.6) | 215 (7.1) | Â |
1–5 times/week | 3402 (38.6) | 1190 (39.2) |  |
> 5 times/week | 5101 (57.9) | 1630 (53.7) |  |
Winter ventilation frequency |  |  | < 0.001 |
0 time/week | 1644 (18.6) | 842 (27.7) | Â |
1–5 times/week | 3742 (42.7) | 1116 (36.8) |  |
> 5 times/week | 3412 (38.7) | 1077 (35.5) |  |
Overall ventilation index |  |  | < 0.001 |
0–3 (low) | 1874 (21.3) | 833 (27.5) |  |
4–5 (intermediate) | 2208 (25.0) | 703 (23.2) |  |
6–8 (high) | 4736 (53.7) | 1499 (49.4) |  |