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The mean and standard deviation of words correctly identified for each sentence length, including the mean and standard deviation collapsed across all lengths (“Overall”).a
| Word length | Mean | SD |
|---|---|---|
| Overall | 12.4 | 6.7 |
| 3 | 8 | 8.0 |
| 5 | 8.4 | 6.6 |
| 7 | 15 | 8.9 |
| 9 | 17 | 10 |
| 11 | 13 | 8.3 |
Scores are given in percent correct. The scores indicate that lip-reading accuracy increases as a function of sentence length, but decreases again for sentences longer than nine words.
