Table 3

Pearson’s product-moment correlation between the dextromethorphan metabolic ratio from each multiple-dose sampling method (the y-axis) and that from the corresponding single-dose method (the x-axis)

Parameter	Correlation Coefficient	P Value	Slope	Intercept	No.
0–2 h urine	0.8994	0.0058	2.984	0.016	7
0–4 h urine	0.9521	0.0001	1.083	0.085	9
0–6 h urine	0.9722	0.0001	1.249	0.071	9
0–8 h urine	0.9378	0.0002	1.164	0.267	9
0–12 h urine	0.9652	0.0001	1.178	0.200	9
0–24 h urine	0.9401	0.0002	2.115	0.048	9
1 h plasma	0.6473	0.2377	0.947	0.589	5
1.5 h plasma	0.7528	0.0508	1.038	0.485	7
2 h plasma	0.8946	0.0161	1.737	0.088	6
3 h plasma	0.8203	0.0126	0.865	0.420	8
4 h plasma	0.9425	0.0001	1.040	0.187	9
5 h plasma	0.8287	0.0212	0.425	0.498	7
6 h plasma	0.6158	0.1410	0.626	0.476	7
8 h plasma	0.5744	0.3111	0.381	0.904	5
AUC	0.8049	0.0090	2.426	0.523	9
6 h saliva	0.8990	0.0148	0.784	0.717	6