Correlation of seasonality with asthma and asthma exacerbation among hospitalised patients in Ghana, 2012–2017
| Asthma | Asthma exacerbation | Total | X2 | P value | |
| N (%) | N (%) | N (%) | |||
| Climate zone | |||||
| South-middle | 15 370 (80.1) | 644 (88.2) | 16 014 (80.4) | 29.6 | <0.001 |
| Northern | 3826 (19.9) | 86 (11.8) | 3912 (19.6) | ||
| Harmattan | |||||
| No | 13 090 (68.2) | 505 (69.2) | 13 595 (68.2) | 0.3 | 0.57 |
| Yes | 6106 (31.8) | 225 (30.8) | 6331 (31.8) | ||
| Seasons (south-middle) | |||||
| Dry (December–March) | 4829 (31.4) | 205 (31.8) | 5034 (31.4) | ||
| Wet (April–June) | 4020 (26.2) | 164 (25.5) | 4184 (26.1) | 0.5 | 0.93 |
| Dry (July–August) | 2456 (16.0) | 108 (16.8) | 2564 (16.0) | ||
| Wet (September–November) | 4065 (26.5) | 167 (25.9) | 4232 (26.4) | ||
| Seasons (northern) | |||||
| Wet (May–September) | 1656 (43.3) | 49 (57.0) | 1705 (43.6) | 6.4 | 0.01 |
| Dry (October–April) | 2170 (56.7) | 37 (43.0) | 2207 (56.4) |