Table 1.

Baseline characteristics and methodological quality of all included studies

First author	Year	Country	Language	Journal	Case number		Gender (male/ female)		Age (year)		Follow- up time (month)
					ACCF	ACDF	ACCF	ACDF	ACCF	ACDF	ACCF	ACDF
Zhang SM [31]	2013	China	Chinese	Chinese Journal of Bone Joint Injury	17	15	10/7	9/6	56.6 (52 ~ 68)	57.3 (50 ~ 64)	12
Li J[22]	2013	China	English	Arch Orthop Trauma Surg	42	47	58/31		51.3 ± 6.5		79.6 (60 ~ 108)
Sun ZF [28]	2013	China	Chinese	Chinese Journal of Bone Joint Injury	16	24	28/12		52.3 (35 ~ 70)		13 ~ 34
Song KJ [20]	2012	Korea	English	Eur Spine J	15	25	11/4	19/6	54.1 ± 9.8	50.3 ± 7.5	72 ~ 171	61 ~ 132
Qi M [27]	2012	China	Chinese	Chinese Journal of Spine and Spinal Cord	94	124	51/43	69/55	54.4 ± 7.8	53.5 ± 8.5	-	42 (18 ~ 60)
Liu Y [26]	2012	China	English	Spine (Phila Pa 1976)	39	69	26/13	39/30	47.8 ± 6.4	46.1 ± 6.8	26.4 (12 ~ 37)	26.8 (12 ~ 39)
Jia XL [25]	2012	China	Chinese	Orthopedic Journal of China	36	31	21/15	17/14	48.8 ± 8.1	49.1 ± 7.7	25 ~ 61
Zhang W [32]	2011	China	Chinese	Orthopedic Journal of China	69	87	92/64		55.1 ± 12.2	52.6 ± 11.4	27.3 ± 20	24.9 ± 24
Guo Q [23]	2011	China	English	Eur Spine J	24	43	13/11	24/19	55.2 ± 10.1	52.7 ± 9.4	37.3 ± 7.3	37.3 ± 7.2
Uribe JS [29]	2009	USA	English	Eur Spine J	38	42	21/17	21/21	50	46.2	26.4	27.6
Oh MC [21]	2009	Korea	English	Spine (Phila Pa 1976)	17	14	16/15		54.5 ± 11.6		12 ~ 63
Yu YL [30]	2007	China	Chinese	Journal of Qiqihar Medical College	20	20	14/6	15/5	53.1 ± 8.9	52.8 ± 7.8	6
Huang SH [24]	2007	China	Chinese	Practical Clinical Medicine	21	23	-	-	-	-	22 (12 ~ 63)

ACCF anterior cervical corpectomy and fusion, ACDF anterior cervical discectomy and fusion.