. 2020 Sep 16;156(12):1–5. doi: 10.1001/jamadermatol.2020.3071

Table 2. Construct Validity Results of WI-NRS and AI-NRS With Measures of Itch, Quality of Life, and Prurigo Nodularis Status.

Variable	WI-NRS^a^,^b			AI-NRS^a^,^b
Variable	Week 2	Week 4	Week 8	Week 2	Week 4	Week 8
AI-VAS (24 h)	0.72^c	0.78^c	0.87^c	0.82^c	0.88^c	0.90^c
WI-VAS (24 h)	0.79^c	0.86^c	0.92^c	0.74^c	0.81^c	0.85^c
eVRS^b	0.65^c	0.65^c	0.72^c	0.66^c	0.65^c	0.72^c
ItchyQoL	0.36^c	0.36^c	0.40^c	0.38^c	0.42^c	0.39^c
DLQI	0.40^c	0.42^c	0.46^c	0.41^c	0.45^c	0.45^c
Healed prurigo lesions, %	–0.32^c	–0.27^d	–0.41^c	–0.25^d	–0.28^d	–0.43^c
Prurigo lesions with excoriations, %	0.28^d	0.25^d	0.38^c	0.21^e	0.23^e	0.40^c

Abbreviations: AI-NRS, Average Itch Numeric Rating Scale; AI-VAS, average itch visual analog scale; DLQI, Dermatology Life Quality Index; eVRS, electronic verbal rating scale; WI-NRS, Worst Itch Numeric Rating Scale; WI-VAS, worst itch visual analog scale.

^{^a}

Spearman correlations.

^{^b}

Weekly mean WI-NRS and eVRS for itch severity scores from the previous week were used for each time point.

^{^c}

P < .001.

^{^d}

P < .01.

^{^e}

P < .05.