Table 2.
Tests for readability analysis
| Test | Score Type | Qualities Assessed | Formula |
|---|---|---|---|
| Flesch-Kincaid Reading Ease | Index score range (0-100, where 100=easiest) | Word complexity, sentence length | 206.835 – (1.015 x ASL) – (84.6 x ASW) |
| Flesch-Kincaid | Grade Level | Word complexity, sentence length | (0.39 x ASL) + (11.8 x ASW) - 15.59 |
| Gunning Fog Score | Grade Level | Word complexity, sentence length | 0.4 (ASL + PHW) |
| Coleman Liau Index | Grade Level | Word complexity, sentence length | 0.0588L – 0.296S – 15.8 |
| SMOG Index | Grade Level | Word complexity, sentence length | 3 + Square Root of Polysyllable Count |
| Automated Readability Index | Grade Level | Word complexity, sentence length | 4.71 (characters/words) + 0.5 (words/sentences) – 21.43 |
ASL: Average sentence length (i.e., the number of words divided by the number of sentences); ASW: Average number of syllables per word (i.e., the number of syllables divided by the number of words); PHW: Percentage of hard words; L: The average number of letters per 100 words; S: The average number of sentences per 100 words