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. 2021 May 17;105(1):117–124. doi: 10.4269/ajtmh.20-1588

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.