| | Variables | Rigidity | Flaccid penile length | Erectile penile length | | Length | Circumference | Length | Circumference |
| | Birthplace | | | | | | | Jiangsu | 3.5 (3.5, 4) | 6.5 (6, 7) | 7.5 (6.9, 8) | 12 (11.2, 13) | 10.8 (10, 11.4) | | Others | 3.5 (3.5, 4) | 6.5 (6, 7) | 7 (6.5, 8) | 12 (11.23, 13) | 11 (10, 11.5) | | Z | −1.900 | −0.592 | −1.331 | −0.692 | −0.994 | | p | 0.057 | 0.554 | 0.183 | 0.489 | 0.320 | | Race | | | | | | | Han | 3.5 (3.5, 4) | 6.5 (6, 7) | 7.2 (6.8, 8) | 12 (11.2, 13) | 11 (10, 11.5) | | Others | 3.5 (3, 3.5) | 7.5 (6.3, 7.7) | 7.1 (6.25, 8.3) | 13 (12.25, 13.8) | 11 (9.75, 11.7) | | Z | −1.968 | −1.54 | −0.193 | −1.812 | −0.118 | | p | 0.049 | 0.123 | 0.847 | 0.07 | 0.906 | | Education | | | | | | | Below bachelor | 3.5 (3.5, 4) | 6.5 (6, 7) | 7.3 (6.8, 8) | 12 (11.2, 13) | 11 (10, 11.5) | | Bachelor | 3.5 (3.5, 4) | 6.5 (6, 7) | 7.2 (6.8, 8) | 12 (11.1, 13) | 11 (10, 11.5) | | Master | 3.5 (3.5, 3.5) | 6.5 (6, 7.25) | 7 (6.75, 7.9) | 12.5 (11.45, 13) | 10.8 (9.95, 11.5) | | Doctor | 3.75 (3.13, 4) | 6.25 (5.63, 6.5) | 6.5 (6.05, 7.38) | 11.65 (11.5, 12.75) | 10.5 (9.85, 11) | | χ2 | 3.376 | 1.248 | 6.285 | 3.411 | 1.677 | | p | 0.337 | 0.742 | 0.099 | 0.332 | 0.642 | | Diet | | | | | | | Balanced | 3.5 (3.5, 4) | 6.5 (6, 7) | 7.25 (6.8, 8) | 12 (11.2, 13) | 11 (10, 11.5) | | Preferred vegetarian | 3.5 (3.5, 4) | 6.5 (6, 7) | 7.2 (6.5, 8) | 12 (11, 13) | 11 (10, 11.63) | | Preferred meat | 3.5 (3, 4) | 6.5 (6, 7.2) | 7.2 (7, 7.8) | 12 (11, 13) | 10.5 (10.3, 11.2) | | χ2 | 0.117 | 0.082 | 1.073 | 0.007 | 1.001 | | p | 0.943 | 0.96 | 0.585 | 0.996 | 0.606 |
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