Table 3.

Comparison of the magnitude of improvement in PROMs between the decompression and fusion groups in the < 70-year and ≥ 70-year age cohorts at < 6 months and ≥ 6 months after surgery

	< 70 years			≥ 70 years
	Decompression	Fusion	p	Decompression	Fusion	p
ΔOΔI
< 6 m	15.7 ± 16.54	16.41 ± 22.31	0.89	15.69 ± 17.94	13.47 ± 17.12	0.51
≥ 6 m	20.32 ± 14.09	20.31 ± 20.06	0.99	18.53 ± 17.97	13.34 ± 18.65	0.22
ΔςAΣ βαχκ
< 6 m	2.55 ± 2.52	2.96 ± 3.14	0.58	2.46 ± 3.72	2.7 ± 3.02	0.71
≥ 6 m	2.28 ± 3.58	3.12 ± 3.04	0.36	2.52 ± 2.6	2.35 ± 3.36	0.8
ΔςAΣ λεγ
< 6 m	2.83 ± 3.82	3.4 ± 3.99	0.55	2.65 ± 4.33	3.55 ± 3.2	0.22
≥ 6 m	3.32 ± 2.01	3.25 ± 4.04	0.95	3.16 ± 3.07	3.2 ± 3.7	0.95
ΔΠXΣ
< 6 m	1.19 ± 8.84	5.58 ± 11.01	0.11	6.24 ± 9.66	6.32 ± 10.64	0.97
≥ 6 m	6.17 ± 11.2	11.15 ± 13.35	0.21	9.33 ± 9.42	7.21 ± 11.74	0.43

Δ represents change score (preoperative minus postoperative). PROMs patient-reported outcome measures, VAS Visual Analog Scale, ODI Oswestry Disability Index, SF-12 PCS 12-Item Short Form Survey Physical Component Score, m months