. 2020 Dec 28;10(1):74. doi: 10.3390/jcm10010074

Table 3.

Median time to improvement and percentage of improvement at discharge and long-term follow-up.

Outcome	Time (Days, 95% CI)	N (%) of Improvement
Outcome	Time (Days, 95% CI)	Discharge	Long-Term Follow-Up
NRS score for back pain	9 (8, 10)	216 (57.1)	232 (61.4)
NRS score for leg pain	12 (10, 12)	186 (49.2)	230 (60.8)
ODI	8 (6, 8)	176 (46.6)	215 (56.9)

Nonparametric maximum-likelihood estimated survival curves generated using the Expectation and Maximization-Iterative Convex Minorant algorithm were utilized to calculate the median time to improvement. Improvement was defined as a change of more than 2 points for the NRS scores for back and leg pain and of more than 10 points for ODI. NRS, numeric rating scale; ODI, Oswestry Disability Index.