Table 3

PPV (95% CI) of OCD codes in relation to the date and age at the first OCD diagnosis, sex and the inclusion of CYBOCS

Criteria	OCD (all diagnoses) PPV (95% CI)	DF42.2 PPV (95% CI)
Diagnosed before 2000	0.74 (0.52 to 0.90) (n=23)	0.64 (0.31 to 0.89) (n=11)
Diagnosed after 2000	0.88 (0.79 to 0.95) (n=77)	0.80 (0.66 to 0.89) (n=54)
	p=0.09	p=0.26
Diagnosed before age 12	0.83 (0.69 to 0.93) (n=42)	0.71 (0.51 to 0.87) (n=28)
Diagnosed after age 12	0.86 (0.75 to 0.94) (n=58)	0.81 (0.65 to 0.92) (n=37)
	p=0.69	p=0.37
CYBOCS not performed	0.75 (0.62 to 0.86) (n=56)	0.59 (0.39 to 0.76) (n=29)
CYBOCS performed	0.98 (0.88 to 1.00) (n=44)	0.92 (0.78 to 0.98) (n=36)
	p=0.001*	p=0.001*
Female	0.88 (0.76 to 0.95) (n=50)	0.88 (0.72 to 0.97) (n=33)
Male	0.82 (0.69 to 0.91) (n=50)	0.66 (0.47 to 0.81) (n=32)
	p=0.41	p=0.03*
All cases included	0.85 (0.76 to 0.91)	0.77 (0.65 to 0.86)

*p<0.05 statistically significant difference.
CYBOCS, Children’s Yale Brown Obsessive Compulsive Scale; OCD, obsessive-compulsive disorder; PPV, positive predictive value.