Clinimetrics of the 9- and 19-Item Wearing-Off Questionnaire: A Systematic Review

Table 1

WOQ-19.

Author	Year	N	Cutoff	Sn	Sp	PPV	NPV
Martinez-Martin et al. [11]	2008	222	2	0.88	0.8	0.88	0.79
Seki et al. [12]	2013	464	1	0.81	0.39	0.62	0.64
Stocchi et al. [13]	2014	617	2	0.90	0.63	0.76	0.84

Sn: sensitivity; Sp: specificity; PPV: positive predictive value; NPV: negative predictive value.