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. Author manuscript; available in PMC: 2016 Oct 1.
Published in final edited form as: Res Aging. 2014 Sep 15;37(7):671–694. doi: 10.1177/0164027514550834

Table 3.

Predictive Validity of the Physical Functioning Measure (N=300)

Functional ability scaled to
NIH PROMIS normative
sample		 Sample size
(N)		 Proportion
released to
rehabilitation
facility following
surgery*
(percent, 95% CI)		 Mean hospital
length of stay
(days, 95% CI)
High functioning (45+) 33 0.5 (0.4, 0.6) 4.9 (4.6, 5.3)
Average functioning (35 to 45) 130 0.7 (0.6, 0.7) 5.5 (5.1, 5.9)
Low functioning (<35) 137 0.8 (0.6, 0.9) 6.1 (5.3, 7.0)
*

Includes acute, subacute, and chronic care rehabilitation facilities.

Legend. Higher (more impaired) physical functioning was associated with a lower odds of discharge to a rehabilitation facility (p<0.001), and a lower length of stay (p=0.02). Estimates are adjusted for age, sex, race, years of education, number of comorbidities, and 3MS score. We selected thresholds of 35 and 45, corresponding to 1.5 SD and 0.5 SD below the PROMIS mean of 50, to divide the sample approximately into tertiles.