Table 8.

Criterion Validity and Responsiveness of several short-form versions of the Danish Need for Recovery Scale against the full 9-item version—confirmatory analyses.

Aim being Addressed	NFR Scale Items Used	Criterion Validity ICC (95% CI) (n = 765)	Responsiveness ICC (95% CI) (n = 475)
Primary Aim	Items 2, 6 & 7	0.88 (0.86, 0.90)	0.80 (0.76, 0.83)
	Items 2 & 6	0.82 (0.80, 0.84)	0.72 (0.67, 0.76)
Secondary Aim	Items 1, 2 & 9	0.86 (0.84, 0.88)	0.73 (0.69, 0.77)

Primary aim: reduction of scale utilizing any NFR item; Secondary aim: reduction of scale using only items 1, 2 and 9. ICC = Intra-class correlation coefficient. For details of each item please refer to Table 1.