Table 2. The odds ratios for opiate dependence according to the presence of cavum pellucidum.
Opiate dependence | Controls | Odds ratio a | 95% CI | p value | |
---|---|---|---|---|---|
Categorical measures of CSP | No. (%) of subjects | ||||
Presence of CSP | 54 (83.1) | 43 (64.2) | 2.74 | 1.21 to 6.21 | 0.016 |
Presence of large CSP b | 12 (18.5) | 4 (6.0) | 3.64 | 1.10 to 12.04 | 0.034 |
Quantitative measures of CSP | Mean (SD) length of CSP, mm | ||||
Length of CSP | 4.17 (5.39) | 2.27 (2.10) | 1.22 | 1.05 to 1.42 | 0.011 |
aValues were risks for opiate dependence in the presence of the CSP and were calculated by the logistic regression model including age and sex as covariates.
bA large CSP was defined by the criterion of ≥ 6 mm in CSP length
cValues were risks for opiate dependence with each 1-mm increase in CSP length and were calculated by the logistic regression model including age and sex as covariates
Abbreviations: CSP, cavum septum pellucidum; No., number; SD, standard deviation; CI, confidence interval