Table 2.

Behavioral performance results in the Tower of London task in patients with obsessive–compulsive disorder (OCD) and healthy controls (HCs) at baseline and follow-up.

Time point	OCD (N = 17)	HC (N = 21)	Statistical analysisa
			Difference		Z	p
Response timeb
Baseline	9.0 ± 2.6	7.5 ± 1.3	Group	Baseline	− 1.982	0.048*
				Follow-up	− 2.246	0.025*
Follow-up	8.4 ± 1.8	7.8 ± 1.1	Time	OCD	− 1.633	0.102
				HC	− 1.512	0.131
Accuracyc
Baseline	79.3 ± 15.3	87.1 ± 8.2	Group	Baseline	− 1.791	0.073
				Follow-up	− 1.794	0.073
Follow-up	85.8 ± 8.9	90.2 ± 5.0	Time	OCD	− 2.059	0.039*
				HC	− 2.068	0.039*
Efficiency (Accuracy/RT)
Baseline	9.4 ± 3.3	12 ± 2.4	Group	Baseline	− 2.950	0.003**
				Follow-up	− 2.716	0.007*
Follow-up	10.9 ± 3.3	13 ± 2.1	Time	OCD	− 2.911	0.004**
				HC	− 1.999	0.046*

Data are shown as the mean ± standard deviation.

SD standard deviation, RT response time.

*The mean difference is significant at the 0.05 level.

**The mean difference is significant at the 0.005 level.

^aMann–Whitney U test for testing the group difference; Wilcoxon signed-rank test for testing the time difference.

^bAverage RT of correct responses, in second.

^cPercentage (%) of correct responses.