Table 3.

Meta-regression analysis for overall symptoms: N-acetylcysteine versus placebo.

Covariate	Coefficient	Standard	95% CI	Z value	P value
Mean age (year)	0.04	0.04	−0.03, 0.11	1.18	0.24
Diagnosis (OCD or OCD-related disorders)	−0.90	0.73	−2.34, 0.54	−1.23	0.22
Study duration (in weeks)	0.02	0.13	−0.24, 0.27	0.13	0.90
Total number of individuals	0.00	0.03	−0.05, 0.06	0.09	0.93
Percentage of female participants	−0.04	0.02	−0.07, 0.00	−1.89	0.06

95% CI 95% confidence interval, OCD obsessive–compulsive disorder.