Table 3.
Mean (SD) differences in Ct values between quantitative assays for ORF1b and N gene.
| Calibrator (n = 14) | Infected cells (n = 9) | NPA (n = 18) | Stool (n = 11) | |
|---|---|---|---|---|
| ΔCt1 | 0.29 (1.03) | 1.32 (0.67)2 | 0.34 (0.79)c | 0.14 (0.79)d |
1
ΔCt, Ct value of a sample in the ORF 1b assay − Ct value of the same sample in the N gene assay.
2
ΔCt statistically different from that of the calibrator (Student t-test, P <0.02; 95% confidence interval, 0.39–1.67).
c,d ΔCt not statistically different from that of the calibrator (Student t-test): cP = 0.89; dP = 0.64.