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| Drug abusers (n = 413) | Controls (n = 503) | All (n = 916) | P value | |
|---|---|---|---|---|
| T/S ratio | 0.778 ± 0.179 | 0.839 ± 0.208 | 0.812 ± 0.199 | 1.32e−06 |
The values are presented as the mean ± SD. P values were calculated using a multivariate regression model adjusted for age and gender.
