Head-injury advice leaflet analysis of reading age using the Simplified Measure of Gobbledygook (SMOG)
| SMOG | SMOG | No of leaflets (%) | Cumulative percentage |
| US grade level | US reader age | N=45 | |
| 8 | 13 | 4 (8.9) | 8.9 |
| 9 | 14 | 8 (17.8) | 26.7 |
| 10 | 15 | 14 (31.1) | 57.8 |
| 11 | 16 | 13 (28.9) | 86.7 |
| 12 | 17 | 6 (13.1) | 100.0 |