Table 2.

Preoperative and 12-month postoperative Patient-Reported Outcomes: mean (standard deviation).

Group	NDI		PCS		MCS		Neck Pain		Arm Pain
	Preop	12 mo	Preop	12 mo	Preop	12 mo	Preop	12 mo	Preop	12 mo
Depressed	62.4 (15.1)	31.6 (21.1)	35.5 (6.6)	42.5 (11.4)	27.0 (5.6)	41.9 (12.0)	7.6 (1.6)	3.3 (2.5)	5.8 (2.8)	3.0 (2.7)
Non-Depressed	48.5 (15.1)	22.8 (18.3)	33.7 (6.7)	45.1 (10.2)	46.6 (8.2)	51.3 (10.5)	6.6 (2.0)	2.7 (2.4)	4.8 (2.8)	1.8 (2.4)
P*	<.001		.688		<.001		<.001		<.001
P†	<.001		<.001		<.001		<.001		<.001
P‡	.050		<.001		<.001		.251		.755

NDI, Neck Disability Index; PCS, Physical Component Summary of the SF-36; MCS, Mental Component Summary of the SF-36.

^*Probability for difference between Depressed and Non-Depressed patients.

^†Probability for difference from preoperative to 12-month postoperative.

^‡Probability for interaction between depression status and change preoperative to 12-month.