Table 7.

Comparison of PROMs between the < 70-year and ≥ 70-year age cohorts preoperatively and at < 6 months and ≥ 6 months after surgery

	< 70 years	≥ 70 years	p*
ODI
Preoperative	38.85 ± 18.06	38.03 ± 17.63	0.755
< 6 months	22.59 ± 18.03 (p# < 0.001)	22.45 ± 17.66 (p# < 0.001)	0.956
≥ 6 months	17.3 ± 18.5 (p# < 0.001)	20.58 ± 18.52 (p# < 0.001)	0.262
VAS back
Preoperative	5.53 ± 2.76	4.82 ± 2.97	0.093
< 6 months	2.62 ± 2.25 (p# < 0.001)	2.27 ± 2.26 (p# < 0.001)	0.284
≥ 6 months	2.23 ± 2.3 (p# < 0.001)	2.19 ± 2.42 (p# < 0.001)	0.896
VAS leg
Preoperative	5.7 ± 3.07	5.43 ± 3.15	0.561
< 6 months	2.41 ± 2.93 (p# < 0.001)	2.43 ± 2.67 (p# < 0.001)	0.963
≥ 6 months	2.18 ± 2.91 (p# < 0.001)	2.06 ± 2.41 (p# < 0.001)	0.793
SF12 PCS
Preoperative	33.2 ± 9.02	31.67 ± 8.23	0.25
< 6 months	37.83 ± 9.93 (p# < 0.001)	38.86 ± 10.23 (p# < 0.001)	0.495
≥ 6 months	43.57 ± 12.41 (p# < 0.001)	40.33 ± 11.04 (p# < 0.001)	0.099

p^# represents p value for difference between preoperative and postoperative scores; p* represents p value for difference in the change scores between the two age cohorts; bold values represent significant p values (p ≤ 0.05). PROM patient-reported outcome measure, VAS Visual Analog Scale, ODI Oswestry Disability Index, SF-12 PCS 12-Item Short Form Survey Physical Component Score