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(b) Chi-square tests
| Value | P value | |
|---|---|---|
| Pearson correlation (r) | 0.179 | 0.303 |
| χ 2 | 0.455 | 0.500 |
| Positive likelihood ratio | 1.235 | |
| Negative likelihood ratio | 0.529 | |
| Sensitivity | 0.824 | |
| Specificity | 0.333 | |
| Positive predictive value | 0.538 | |
| Negative predictive value | 0.667 |
