To examine parental predictors of offspring diagnoses, we conducted GEE analyses, including paternal and maternal TS, OCD, and ADHD diagnoses as predictor variables. Gender was included as a covariate in all analyses. Maternal OCD (OR=2.10, p=0.003) and paternal OCD (OR=1.97, p=0.018) were associated with offspring diagnoses of OCD, as was maternal ADHD (OR=1.82, p=0.023), although maternal or paternal TS and paternal ADHD were not (overall model: X2=32.5, p<0.00001). Paternal ADHD (OR=3.35, p<0.0001), maternal ADHD (OR= 2.26, p=0.006), and male gender (OR=0.35, p<0.0001), but not parental TS or OCD, were associated with offspring ADHD (overall model: X2=54.4, p<0.00001). Results of analyses using all parental tic (TS or CMVT) and OCD/OCB diagnoses gave similar results.
