Table 3.
Driving frequency and percentage of increase of LF/HF rati o
| No sign | 750 | 3500 | |
| None | 0.90 | 0.50 | 0.70 |
| Yes | 0.64 | 0.64 | 0.36 |
"Yes" including "everyday" and "occasionally" in Table 1.
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