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Mean number of the primary, secondary, and fragmentary rugae between sexes.
| Type of ruga | Men (N = 110) | Women (N = 233) | P value | ||
|---|---|---|---|---|---|
| Mean | SD | Mean | SD | ||
| Primary ruga | 3.4 | 0.7 | 3.4 | 0.6 | 0.838 |
| Secondary ruga | 1.1 | 0.6 | 1.3 | 0.6 | 0.024 |
| Fragmentary ruga | 1.0 | 0.8 | 1.1 | 0.7 | 0.229 |
SD: standard deviation.
