Multivariable logistic regression model for schizophrenia.

SE: standard error; CI: confidence interval.
Gating is defined as a dichotomous variable: P50 gating ratio greater than 0.4 or not.
Smoke is defined as a dichotomous variable: smoking or not.
a Wald chi-square tests.
bP-values were 2-sided.
Multivariable logistic regression model: n  = 160, percentage of concordant pairs  = 90.4%, percentage of discordant pairs  = 9.6%, c statistic  = 0.9043, Hosmer-Lemeshow Goodness-of-Fit test p  = .640>.05 (df  = 8).
The estimated probability of having schizophrenia (the predicted value, ) can be obtained by using the following formula:
where Gating equals 1 if P50 gating ratio >0.4, and 0 otherwise; Smoke equals 1 if smoking, and 0 otherwise.