Comparative Readability Analysis of Online Patient Education Resources on Inflammatory Bowel Diseases

Table 1

List of formulae used by different readability grade estimation models for textual information.

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Coleman-Liau Index = 0.0588L − 0.296S − 15.8

Flesch-Kincaid = (0.39 ASL) + (11.8 ASW) − 15.59

New Dale-Chall = 0.1579 PDW 0.0496 ASL + 3.6365

Gunning Fog = 0.4 (ASL + PHW)

SMOG = 3 +

Flesch Reading Ease = 206.835 − (1.015 ASL) − (84.6 ASW)

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L: mean number of letters per 100 words; S: mean number of sentences per 100 words; ASL: mean number of words per sentence; ASW: mean number of syllables per word; ASL: mean number of words per sentence; PDW: percentage of words that are not on a list of words that an American 4th grader can understand; PHW: percentage of words containing 3 or more syllables; PSW: number of words containing 3 or more syllables in 10 consecutive sentences from the beginning, middle, and end; ASL: mean number of words per sentence; ASW: mean number of syllables per word.