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American population according to reading level (N=328 million).
| Reading level | US population (millions), n (%) |
| 6th grade | 323 (98.5) |
| 7th grade | 317 (96.6) |
| 12th grade | 287 (87.5) |
| University 1st year | 190 (57.9) |
| University 2nd year | 127 (38.7) |
| University 3rd to 4th year | 95 (28.9) |
| Master’s and Professional degree | 33 (10.1) |
| Doctorate | 7 (2.1) |
