Table 4.
Pearson’s correlation and Deming regression analysis of Xpert HCV VL against Roche HCV tests
| Genotype | N | Pearson’s correlation | Deming regression | ||||
|---|---|---|---|---|---|---|---|
| r | P value | Intercept (95% CI) | Slope (95% CI) | T-value | Df | ||
| All | 180 | 0.97 | < 0.001 | 0.70 (0.32, 1.08) | 0.84 (0.79, 0.90) | 1.97 | 178 |
| GT1 | 108 | 0.87 | < 0.001 | 0.71 (0.11, 1.31) | 0.84 (0.74, 0.94) | 1.98 | 106 |
| GT2 | 20 | 0.93 | < 0.001 | 1.54 (0.84, 2.25) | 0.66 (0.53, 0.80) | 2.10 | 18 |
| GT3 | 26 | 0.87 | < 0.001 | 1.96 (0.59, 3.35) | 0.65 (0.44, 0.86) | 2.06 | 24 |
| GT4 | 17 | 0.88 | < 0.001 | 0.16 (−0.79, 1.11) | 0.97 (0.79, 1.45) | 2.13 | 15 |
| GT6 | 1 | NA | NA | NA | NA | ||
| Indeterminate | 8 | 0.99 | < 0.001 | −0.06 (−1.06, 0.93) | 0.97 (0.77, 1.17) | 2.45 | 6 |
CI = confidence interval; Df = N-2 degrees of freedom; NA = not applicable.