Table 3.

Readability Analysis Score Descriptions.

Flesch Reading Ease score	100-90	Very easy to read, easily understood by an average 11-y-old student
	90-80	Easy to read
	80-70	Fairly easy to read
	70-60	Easily understood by 13- to 15-y-old students
	60-50	Fairly difficult to read
	50-30	Difficult to read, best understood by college graduates
	30-0	Very difficult to read, best understood by university graduates
Gunning-Fog grade level	6-8	Sixth grade to eighth grade
	9-12	High school freshman—senior
	13-15	College freshman—junior
	16	College senior
	17-20	Postgraduate
	20+	Postgraduate plus
Dale-Chall readability formula	<4.9	Easily understood by an average fourth-grade student or lower
	5.0-5.9	Easily understood by an average fifth- or sixth-grade student
	6.0-6.9	Easily understood by an average seventh- or eighth-grade student
	7.0-7.9	Easily understood by an average 9th- or 10th-grade student
	8.0-8.9	Easily understood by an average 11th- or 12th-grade student
	9.0-9.9	Easily understood by an average college student

Note. Readability analysis systems of Flesch Reading Ease score (high number represents text that is easy to read and low number is representative of more difficult text), Gunning-Fog index (score correlated to American grade level), Dale-Chall readability formula (score ranges 1-10 with grade level <4.9 indicating fourth grade level and 10 indicating college student grade level).