Table 4.

Multivariate analysis of factors associated with early improvement

Item	Odds ratio (95% CI)	p value
Age		0.022*
≥ 40	1
< 40	1.71 (1.12–4.35)
Baseline Pfirrmann grade		0.032*
Grade IV or V	1
Grade II or III	1.86 (1.17–5.41)
Symptom duration before injection (months)		0.214
≥ 6	1
< 6	0.99 (0.16–5.64)
Herniation on MRI		0.041*
Without high-intensity signal	1
With high-intensity signal	1.87 (1.06–5.27)
Decrease of herniated mass volume		0.145
< 50%	1
≥ 50%	0.98 (0.42–6.42)

^* p < 0.05