Table 2.
HA frequency and onset time.
| Did Ha appear, n (%) | |
| Headache | 133 (10.4) |
| No headache | 1149 (89.6) |
| When Ha appeared, n (%) | |
| Before the movie | 21 (16.4) |
| During the movie | 60 (46.9) |
| After the movie | 47 (36.7) |
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