Clinical Study
A Comparative Study of Palatal Rugae Patterns among Igbo and Ikwerre Ethnic Groups of Nigeria: A University of Port Harcourt Study
Table 2
-test of proportionality difference in rugae pattern distribution between Ikwerre and Igbo females.
| Pattern | Tribe | Obs. population () | Sampled population () | Obs. proportion | -value (calculated) | critical | value (obs.) | Inference |
| Wavy | Ikwerre | 117 | 289 | 0.405 | ā4.7572 | 1.96 | <0.0001 | Significant difference in proportions
*
| Igbo | 188 | 314 | 0.599 |
| Curvy | Ikwerre | 99 | 289 | 0.343 | 2.1791 | 1.96 | 0.02926 | Significant difference in proportions
*
| Igbo | 82 | 314 | 0.261 |
| Circular | Ikwerre | 14 | 289 | 0.048 | ā0.9672 | 1.96 | 0.33204 | No significant difference in proportions | Igbo | 21 | 314 | 0.067 |
| Straight | Ikwerre | 34 | 289 | 0.118 | 3.1373 | 1.96 | 0.00168 | Significant difference in proportions
*
| Igbo | 15 | 314 | 0.048 |
| Converging | Ikwerre | 7 | 289 | 0.024 | 0.7289 | 1.96 | 0.4654 | No significant difference in proportions | Igbo | 5 | 314 | 0.016 |
| Diverging | Ikwerre | 18 | 289 | 0.062 | 3.5282 | 1.96 | 0.00042 | Significant difference in proportions
*
| Igbo | 3 | 314 | 0.01 |
|
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The asterisks were used to demonstrate values with significant difference.
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