| Raining ambient | No raining ambient | ||||
| Before | After | Δ (%) | Before | After | Δ (%) |
CP1 | 66.8 ± 0.3 | 64.1 ± 0.5 | −4.0 | 66.5 ± 0.4* | 63.1 ± 0.2 | −5.1 |
CP2 | 65.4 ± 1.2* | 62.0 ± 0.3 | −5.2 | 65.7 ± 0.8 | 63.9 ± 0.5 | −2.7 |
CP3 | 63.0 ± 0.4 | 60.6 ± 0.3 | −3.8 | 63.1 ± 0.3 | 60.9 ± 0.4 | −3.5 |
Mean value | 65.1 ± 0.6 | 62.2 ± 0.4 | −4.3 | 65.1 ± 0.5 | 62.6 ± 0.4 | −3.8 |