. Author manuscript; available in PMC: 2022 Apr 1.

Published in final edited form as: Arthritis Care Res (Hoboken). 2021 Apr;73(4):559–565. doi: 10.1002/acr.24159

Table 3.

Cross-sectional anchor-based important difference estimates of gait speed

	Anchor	Mean Difference (m/min)		Effect Size
	Anchor	Best vs. Middle^*	Middle vs. Worst^*	Best vs. Middle	Middle vs. Worst
20-m gait speed	WOMAC function^a	2.2	6.9	0.19	0.56
	SF-12 function^b	5.4	6.4	0.48	0.51
	Chair Stand Rate^c	3.8	6.6	0.33	0.56
400-m gait speed	WOMAC function^d	3.0	6.2	0.25	0.49
	SF-12 function^e	5.7	5.7	0.49	0.45
	Chair Stand Rate^f	4.6	6.9	0.39	0.58

^a.

n=2521 persons

^b.

n=2499 persons

^c.

n=2382 persons

^d.

n=2420 persons

^e.

n=2399 persons

^f.

n=2293 persons.

^b.

WOMAC function: Western Ontario and McMaster Universities Osteoarthritis Index range from 0 (best function) to 68 (most functional limitations). SF-12 function: Medical Outcomes Study Short Form 12 Physical Component Summary Scale Score range from 0 (worst function) to 100 (best function).

Difference in gait speed between individuals in the best tertile and middle tertile for each anchor and for individuals in middle and worst tertile for each anchor.

Bold indicates important difference was considered usable (sample size at least 10, correlation between the anchor and gait speed at least 0.3, and corresponding effect size within a plausible range of 0.2–0.8).