Table 4.

Sensitivity analysis with age- and sex-matched subgroups

Effect of 25(OH)D on the presence of CTD, comorbid OCD and ADHD
Dependent variablea	OR	95% CI	p
CTD	1.18	0.75–1.86	0.46
Tic onset	2.11	0.85–5.26	0.11
CTD comorbid OCD	1.83	1.20–2.80	0.01*
CTD comorbid ADHD	0.55	0.34–0.91	0.02*

^aThe dependent variable is the presence of CTD, tic onset, OCD or ADHD and the primary predictor variable is adjusted 25(OH)D (1-unit change = 10 ng/ml). 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