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. 1998 Jul 25;317(7153):264–265. doi: 10.1136/bmj.317.7153.264

Table.

Readability of patient information leaflets about asthma

SMOG grade* No (%) of leaflets (n=104) Cumulative %
5 3 (2.9) 2.9
6 10 (9.6)  12.5
7 12 (11.5) 24.0
8 27 (26.0) 50.0
9 19 (18.3) 68.3
10 18 (17.3) 85.6
11 5 (4.8) 90.4
12 10 (9.6)  100.0
*

Simple measure of gobbledegook (SMOG) readability grades 3-8 are equivalent to reading ability of people with a primary level of education, grades 9-12 are equivalent to those with secondary level education.  

Sixty leaflets were too short to analyse (<30 sentences), four leaflets were excluded because they were not written in English.