Table 2.

Four-year course of QoL (EQ-5D) of patients with OCD and comparison with QoL of the general population with one-sample t tests^a and within-time between-group effect sizes of OCD group versus general population^b

EQ-5D	Baseline Mean (SD) n t(df) p ES	2-Year follow-up Mean (SD) n t(df) p ES	4-Year follow-up Mean (SD) n t(df) p ES
Total sample	0.67 (0.28) 228 t(227) = − 11.80 < 0.01*	0.75 (0.25) 215 t(214) = − 8.09 < 0.01*	0.73 (0.25) 220 t(219) = − 9.62 < 0.01*
	0.92	0.58	0.67
Chronic OCD	0.65 (0.28) 137 t(136) = − 10.05 <0.01*	0.70 (0.24) 125 t(124) = − 8.93 <0.01*	0.66 (0.25) 129 t(128) = − 10.37 <0.01*
	1.00	0.79	0.96
Intermittent OCD	0.75 (0.21) 22 t(21) = − 3.20 < 0.01*	0.85 (0.18) 21 t(20) = − 1.07 0.30	0.81 (0.14) 22 t(21) = − 2.74 0.01*
	0.68	0.20	0.39
Remitting OCD	0.69 (0.30) 69 t(68) = − 5.62 < 0.01*	0.83 (0.24) 69 t(68) = − 2.02 0.05*	0.83 (0.24) 69 t(68) = − 2.20 0.03*
	0.80	0.24	0.24

^aOne-sample t test against test value 0.89

^bES = within-time between-group effect size of OCD group versus general population (Cohen’s d), obtained using pooled standard deviations assuming SD = 0.20 for the general population

*p < 0.05