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. Author manuscript; available in PMC: 2014 Feb 28.
Published in final edited form as: Psychiatry Res. 2012 Oct 4;205(3):269–275. doi: 10.1016/j.psychres.2012.09.029

Table IV.

Logistic Regression Model for Explosive Outbursts in TS, US Model

Odds Ratio (Standard Error) 95% CI Z p value
Gender (Female) 0.23 (0.17) 0.06–0.99 −1.98 0.06
ADHD 6.81 (4.22) 2.02–22.93 3.10 0.002
OCD 1.66 (1.08) 0.47–5.93 0.78 0.43
Maternal tobacco use during pregnancy 5.52 (4.59) 1.08–28.19 2.06 0.04
Twin birth 4.93 (8.51) 0.17–145.32 0.92 0.36
*

N = 110, LR Χ2 = 23.31, p =0.0003, pseudo R2 = 0.19

*

Note: use of fertility drugs was dropped from the model because it perfectly predicted presence or absence of the outcome variable: both of the two individuals with the exposure had explosive outbursts, and none of the individuals without explosive outbursts had the exposure.