TABLE 1.
Comparison of readability scores of United Kingdom and United States approved COVID‐19 vaccines
| Flesch reading ease | Flesch‐Kincaid grade level | Gunning‐fog index | SMOG index | Reach (%) | Grade | Number of words | Number of sentences | Words per sentence | Syllables per word | Reading time (s) | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| UK regulator (MHRA) | |||||||||||
| Pfizer/BioNTech | 56.9 | 8.1 | 9.1 | 10.2 | 84 | B | 1344 | 122 | 11 | 1.6 | 358 |
| AstraZeneca | 50.5 | 8.7 | 9.5 | 10.7 | 81 | B | 1570 | 155 | 10.1 | 1.7 | 418 |
| Moderna | 54.5 | 8.5 | 9.2 | 10.7 | 82 | B | 1437 | 127 | 11.3 | 1.7 | 383 |
| Mean | 54.0 | 8.4 | 9.3 | 10.5 | 82.3 | B | 1450.3 | 134.7 | 10.8 | 1.7 | 386.3 |
| US regulator (FDA) | |||||||||||
| Pfizer/BioNTech | 53 | 7.6 | 7.1 | 9.6 | 85 | A | 1670 | 228 | 7.3 | 1.7 | 445 |
| Moderna | 54 | 7.7 | 7.5 | 10.1 | 85 | A | 1623 | 195 | 8.3 | 1.7 | 432 |
| Mean | 53.5 | 7.65 | 7.3 | 9.85 | 85 | A | 1646.5 | 211.5 | 7.8 | 1.7 | 438.5 |