TABLE III.

Percentage of Patients with TTNP Less Than TTSS or Death for Surgery Versus Nonoperative Care^*

Cohort Age (yr)	Mild DCM (%)				Moderate-to-Severe DCM (%)
	ACDF	ADR	LAMP	PDIF	ACDF	ADR	LAMP	PDIF
40	54.51	53.35	57.00	53.85	93.98	91.75	98.90	93.11
45	54.37	53.23	56.88	53.75	93.76	91.53	98.64	92.87
50	54.19	53.05	56.67	53.60	93.36	91.18	98.25	92.48
55	53.89	52.78	56.35	53.35	92.82	90.65	97.61	91.97
60	53.41	52.36	55.82	52.80	91.85	89.74	96.55	91.09
65	52.76	51.66	55.06	52.23	90.39	88.38	95.03	89.74
70	51.62	50.59	53.83	51.11	88.18	86.27	92.61	87.59
75	49.79	48.96	51.98	49.55	84.82	83.11	88.94	84.28
80	47.31	46.51	49.26	47.04	79.97	78.29	83.56	79.59
85	43.94	43.20	45.58	43.67	73.53	72.03	76.40	73.15

^*A proportion of <50% indicates that nonoperative care is superior; a proportion of >50% indicates that surgery is superior. TTNP = time to neurologic progression, TTSS = time to second surgery, DCM = degenerative cervical myelopathy, ACDF = anterior cervical discectomy and fusion, ADR = cervical disc arthroplasty, LAMP = laminoplasty, and PDIF = posterior cervical decompression and instrumented fusion.