Table 4.

Multivariate analysis for 50% improvements at 2-year postoperative for NDI score.^a

Variable	Odds Ratio (95% CI)	P Value
Gender (% female)	0.899 (0.495–1.631)	.725
Previous cervical surgical history	0.556 (0.247–1.250)	.155
Baseline NDI	1.011 (0.958–1.068)	.684
Baseline SF-36 PCS	1.053 (1.016–1.091)	.005
Baseline SF-36 MCS	1.028 (1.003–1.054)	.028
Arm pain greater than neck pain	1.319 (0.683–2.546)	.410

Abbreviations: NDI, neck disability index; SF-36 MCS, Short-Form 36 Mental Component Summary; SF-36 PCS, Short-Form 36 Physical Component Summary.

^aBold indicates significant values.