Table 2.

Effect of 25(OH)D on the presence of CTD, comorbid OCD, and ADHD

Dependent variablea	OR	95% CI	p
CTD	2.08	1.27–3.42	< 0.01*
Tic onset	1.73	0.91–3.29	0.10
CTD comorbid OCD	1.46	1.04–2.04	0.03*
CTD comorbid ADHD	0.55	0.36–0.84	0.01*

^aThe dependent variable is the presence of CTD, OCD, or ADHD and the primary predictor variable is adjusted 25(OH)D (1-unit change = 10 ng/ml), while sex, age, and comorbidity, other than that being tested, were also entered as covariates. The odds are calculated for 1-unit change (i.e., 10 ng/ml) in our predictor variable

CTD chronic tic disorder, OCD obsessive–compulsive disorder, ADHD attention-deficit hyperactivity disorder

*The significant difference with p < 0.05