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. 2015 Dec 16;10:185. doi: 10.1186/s13018-015-0330-5

Table 2.

Pre- and postoperative NDI, JOA scores, and JOA scores IR (means ± standard deviation)

	Preoperative	Postoperative follow-up
	Preoperative	1 month	3 months	6 months	12 months	Last follow-up
NDI (%)^a	61.17 ± 3.54	33.61 ± 3.17	30.53 ± 2.91	23.86 ± 2.54	21.08 ± 2.30	18.64 ± 2.73
JOA^a	9.39 ± 0.84	12.14 ± 1.36	12.44 ± 1.36	13.47 ± 1.08	14.19 ± 1.19	14.78 ± 1.27
JOA IR^b		36.14	40.08	53.61	63.07	70.83

NDI Neck Disability Index, JOA Japanese Orthopaedic Association, IR improvement rate

^aData are displayed as means ± standard deviation

^bData are displayed as a percentage