Readability score No of Leaflets (%) Cumulative %
SMOG*
11 2 (2) 2
12 9 (8) 10
13 32 (30) 40
14 42 (39) 79
15 14 (13) 92
16 4 (4) 96
17 3 (3) 98
18 2(2) 100
Flesch-Kincaid**
5 1 (1) 1
6 5 (5) 6
7 5 (5) 11
8 4 (4) 15
9 8 (7) 21
10 10 (9) 30
11 28 (26) 56
12 31 (29) 85
13 10 (9) 94
14 3 (3) 97
15 2 (2) 99
16 0 (0) 99
17 1 (1) 100
*SMOG score of ≤5 is recommended for health information. **Flesch-Kincaid score of 4-6 is recommended for health information.
Table 1: SMOG score values of Allergy UK leaflets from 2008, 2010, 2012 and 2013.