Table 4.
Regression coefficients, odds ratio and 95% confidence interval for factors associated with PCR inhibition estimated using univariable logistic regression.
| Parameters | Category | b | s.e (b) | Odds ratio | 95% CI | P |
|---|---|---|---|---|---|---|
| Fecal culture | Positive | 0.45 | 0.28 | 1.09 | 0.51, 2.31 | 0.83 |
| Negative | 0 | - | 1 | - | - | |
| A260/A280 ratio | <1.8 | 0.07 | 0.60 | 13.88 | 3.97, 48.45 | <0.001 |
| ≥1.8 | 0 | - | 1 | - | - | |
| A260/A270 ratio | <1.2 | 0.17 | 0.34 | 6.44 | 2.76, 15.06 | <0.001 |
| ≥1.2 | 0 | - | 1 | - | - | |
| DNA concentration | High | 0.11 | 0.43 | 10.94 | 4.12, 29.06 | <0.001 |
| Low | - | - | 1 | - | - | |
| Protein concentration | High | 0.07 | 0.52 | 19.33 | 6.25, 59.76 | <0.001 |
| Low | - | - | 1 | - | - |
b, regression coefficient; se, standard error; CI, confidence interval.