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| No. of events | Mean ± SD | Median | |
|---|---|---|---|
| 6am–6pm | 279 | 32.06 ± 20.11 | 24 |
| 10am–4pm | 172 | 27.55 ± 11.58 | 24 |
| 10am–4pm (at least 30 mins of exposure) | 68 | 43.02 ± 16.22 | 36 |
