One-minute stair climbing, 50-foot walk, and timed up-and-go were responsive measures for patients with chronic low back pain undergoing lumbar fusion surgery

Table 3 Baseline, follow-up, and change scores for physical capacity tasks of improved and unchanged patients

Physical capacity task	Construct-specific GPE used for classification of improved/unchanged	GPE categories^a	Baseline T1 Mean (SD)	Follow-up T2 Mean (SD)	Change score T2-T1 Mean (SD)
5-min walk (m)	GPE_walking	Improved (n = 32)	403.2 (94.2)	484.9 (66.7)	81.7 (75.1)
5-min walk (m)	GPE_walking	Unchanged (n = 22)	445.5 (73.3)	474.7 (93.0)	29.2 (59.9)
1-min stair climbing (steps)	GPE_{stair climibing}	Improved (n = 33)	95.3 (26.9)	125.0 (24.3)	29.7 (23.6)
1-min stair climbing (steps)	GPE_{stair climibing}	Unchanged (n = 22)	114.1 (20.7)	127.1 (22.3)	13.0 (19.4)
50-ft walk (s)^a	GPE_walking	Improved (n = 33)	9.9 (3.8)	7.7 (1.5)	−2.2 (3.3)
50-ft walk (s)^a	GPE_walking	Unchanged (n = 22)	8.6 (2.4)	8.3 (2.4)	−0.3 (1.5)
Timed up-and-go (s)^a,b	GPE_walking	Improved (n = 33)	9.0	5.8	−3.2 (4.1)
	GPE_walking	Unchanged (n = 22)	6.9 (1.6)	6.4 (1.9)	−0.5 (1.6)
	GPE_{chair rise}	Improved (n = 31)	9.1 (4.4)	5.7 (1.2)	−3.4 (4.0)
	GPE_{chair rise}	Unchanged (n = 28)	7.1 (1.6)	6.4 (1.9)	−0.7 (1.6)

GPE Global Perceived Effect scale, SD Standard deviation, T1 Baseline assessment, T2 6-month follow-up assessment
^aA negative score indicates improvement. ^bThe results for timed up-and-go are presented for the classifications of the construct-specific GPE scales for both walking and chair rise since this task includes both these activities.