Effects of neonatal citalopram dose on intromission behavior. The effects of SAL (n = 16), CTM5 (n = 16), CTM10 (n = 15) and CTM20 (n = 11) on (a.) The percentage of rats displaying intromission behavior. Kaplan-Meier survival analysis of intromission behavior using Log-Rank (Mantel-Cox) statistic did not reveal a significant effect of treatment on intromission behavior (Log-Rank = 4.495, df = 3, P = 1730). A significant linear trend for a dose-dependent reduction in the percentage of rats intromitting was found (Log-rank test for trend = 4.495, df =1, P = 0.0340). (b.) number of intromissions. Single-factor ANOVA followed by Bonferroni corrected t-test and Post-test for linear trend. A significant dose-dependent trend for a reduction in intromission number was found.