Table 5.
Bland-Altman Plot analysis of Xpert HCV VL against Roche HCV tests
| Genotype | N | Mean difference ± SD (95% CI) | Lower LOA (95% CI) | Upper LOA (95% CI) | Inside LOA | Outside LOA |
|---|---|---|---|---|---|---|
| (log10 IU/mL) | (log10 IU/mL) | (log10 IU/mL) | n (%) | n (%) | ||
| All | 180 | −0.25 ± 0.51 (−0.33, −0.18) | −1.24 (−1.37, −1.12) | 0.74 (0.61, 0.87) | 169 (93.9) | 11 (6.1) |
| GT1 | 108 | −0.26 ± 0.49 (−0.36, −0.17) | −1.22 (−1.37, −1.06) | 0.69 (0.53, 0.84) | 100 (92.6) | 8 (7.4) |
| GT2 | 20 | −0.45 ± 0.49 (−0.68, −0.22) | −1.40 (−1.81, 1.01) | 0.51 (0.11, 0.91) | 19 (95.0) | 1 (5.0) |
| GT3 | 26 | −0.21 ± 0.52 (−0.42, 0.00) | 0.18 (−1.61, 0.88) | 0.83 (0.45, 1.20) | 24 (92.3) | 2 (7.7) |
| GT4 | 17 | −0.01 ± 0.66 (−0.35, 0.33) | −1.30 (−1.89, −0.71) | 1.28 (0.67, 1.87) | 16 (94.1) | 1 (5.9) |
| GT6 | 1 | NA | NA | NA | NA | NA |
| Indeterminate | 8 | −0.20 ± 0.27 (−0.43, 0.02) | −0.744 (−1.14, −0.33) | 0.32 (−0.08, 0.74) | 8 (100.0) | 0 (0.0) |
CI = confidence interval; LOA = limits of agreement; NA = not applicable.