Psychometric evaluation of the PROMIS SD-SF-8b instrument in individuals experiencing vasomotor symptoms due to menopause

Table 1 Confirmatory factor analysis

Hypothesized model structure	Statistic^a	PROMIS SD-SF-8b total score (N = 1018)
All items constitute one factor	SRMR	0.047
	NNFI	0.990
Factor loadings
Item 1: my sleep was restless		0.763
Item 2: I was satisfied with my sleep		0.812
Item 3: my sleep was refreshing		0.751
Item 4: had difficulty falling asleep		0.510
Item 5: had trouble staying asleep		0.774
Item 6: had trouble sleeping		0.823
Item 7: got enough sleep		0.757
Item 8: my sleep quality was…		0.870

NNFI Non-normed fit index, PROMIS SD-SF-8b Patient-Reported Outcomes Measurement Information System Sleep Disturbance – Short Form 8b, SRMR Standardized root mean residual
^aRules for assessing the model fit – SRMR: ≤0.08, NNFI: ≥ 0.95 [27]

ISSN: 1477-7525