Table 3

Improvement in Patient-Reported Outcomes Measurement Information System physical function after lumbar decompression.

Outcome Measure	Mean ± SD	n	MCID Achievement	P Value^a
PROMIS-PF
Preoperative	37.4 ± 6.8	91	-	-
6 wk	43.4 ± 8.2	64	64.8%	<0.001
12 wk	50.3 ± 10.2	39	84.8%	<0.001
6 mo	43.8 ± 7.0	20	68.4%	0.002
1 y	46.5 ± 9.0	21	70.0%	<0.001
VAS back
Preoperative	6.2 ± 2.5	76	-	-
6 wk	2.7 ± 2.6	62	72.6%	<0.001
12 wk	1.7 ± 2.3	25	88.0%	<0.001
6 mo	2.9 ± 2.9	17	76.5%	<0.001
1 y	2.8 ± 3.0	16	68.7%	0.023
VAS leg
Preoperative	6.0 ± 2.9	76		-
6 wk	3.0 ± 2.9	62	65.5%	<0.001
12 wk	1.7 ± 2.6	25	76.0%	<0.001
6 mo	1.6 ± 2.0	17	70.6%	<0.001
1 y	2.6 ± 2.9	16	62.5%	0.006
TTC (sec)				P value^b
Preoperative	69.0 ± 61.7	87	-	-
6 wk	66.8 ± 52.2	53	-	0.999
12 wk	72.0 ± 39.8	30	-	0.999
6 mo	55.0 ± 40.1	12	-	0.912
1 y	70.6 ± 23.6	17	-	0.999

aP values calculated using paired t test.
bP values calculated using 1-way ANOVA post hoc Tukey.
LD, lumbar decompression; MCID, minimum clinically important difference; PROMIS-PF, Patient-Reported Outcomes Measurement Information System physical function; TTC, time to complete; VAS, visual analog scale.