Table 1 Hours reported as devoted to human evolution and general evolution in high school biology classes (column percentages)
From: Teaching evolution in U.S. public schools: a continuing challenge
| 2007 (N = 926) | 2019 (N = 752) | |||
|---|---|---|---|---|
| Human evolution | General evolutionary processes | Human evolution | General evolutionary processes | |
| Not covered | 17% | 1% | 17% | 5% |
| 1–2 h | 35% | 9% | 28% | 8% |
| 3–5 h | 25% | 23% | 20% | 13% |
| 6–10 h | 12% | 27% | 14% | 25% |
| 11–15 h | 4% | 17% | 7% | 18% |
| 16-20 h | 2% | 11% | 5% | 14% |
| 20 h or more | 2% | 10% | 5% | 13% |
| No answer provided | 2% | 2% | 4% | 4% |
| Total | 100% | 100% | 100% | 100% |
| Mean hours | 4.1 | 9.8 | 7.7 | 12.4 |
| Standard Deviation | 4.8 | 6.3 | 6.3 | 6.8 |