Table 2.
Comparative analysis of readability metrics (ClinicalTrials.gov, 2005–2024, n = 5239)
| Metric | Score | References [11] | ||||
|---|---|---|---|---|---|---|
| Flesch Reading Ease | 55.13 (SD = 8.97) (range = 98.78) | Flesch Reading Ease Score | Estimated school grade completion | Estimated percent of US adults | ||
| 90–100 | 4th grade | 93 | ||||
| 80–90 | 5th grade | 91 | ||||
| 70–80 | 6th grade | 88 | ||||
| 60–70 | 7 or 8th grade | 83 | ||||
| 50–60 | Some high school | 54 | ||||
| 30–50 | High school to college | 33 | ||||
| 0–30 | College | 4.5 | ||||
| Flesch- Kincaid Grade Level | 10.99 (SD = 2.45) (range = 41.3) | Flesch-Kincaid Grade Level | Education Level Correspondence | |||
| 4–5 | Intermediate elementary school (4th-5th grade) | |||||
| 6–7 | Middle school (6th–7th grade) | |||||
| 8–9 | Early high school (8th–9th grade) | |||||
| 10–11 | Late high school (10th–11th grade) | |||||
| 12–13 | College level (12th grade–1st year college) | |||||
| 14–15 | College graduate level (2nd-year college–graduate) | |||||
| 16+ | Professional and advanced degrees | |||||
| Gunning Fog Index | Reading level by grade | |||||
| Gunning Fog Index | 10.91 (SD = 2.80) range = 46.96) | 13 | College freshman | |||
| 12 | High school senior | |||||
| 11 | High school junior | |||||
| 10 | High school sophomore | |||||
| 9 | High school freshman | |||||
| 8 | 8th grade | |||||
| 7 | 7th grade | |||||
| 6 | 6th grade | |||||