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2 × 2 contingency table showing the four quadrants used for the Cochran-Mantel-Haenszel chi-square test, based on 95 video samples with 15 events each, resulting in a total of 1,425 events.
| Eye movement |
|||
| Present | Absent | ||
| Inner brow raiser | Present | 198 (movement + tension) | 13 |
| Absent | 0 | 1,214 | |
