Table 2. Summary of pre- and postoperative SACS(°) in relation to the levels involved.

No. of levels	Preop	Last postop	Mean increase in SACS
1-level	15.4±8.6	22.0±7.8	6.6±2.6
C4	15.2±5.6	22.4±4.2	7.2±2.5
C5	15.6±9.2	22.2±8.4	6.6±2.7
C6	16.2±7.0	22.0±7.2	5.7±1.4
C7	−3.0±4.2	10.5±7.8	13.5±3.5
2-level	20.7±3.6	27.8±4.0	6.9±5.0
C4–5	19.6±4.1	26.4±2.9	6.6±4.9
C5–6	22.4±2.4	29.8±4.9	7.4±5.7

No., number; SACS, sagittal alignment of the whole cervical spine; Preop, preoperative; Postop, postoperative.