表 2-1.

组别 Group	例数 n	下位相邻节段活动度 Lower adjacent segment range of motion					颈椎整体活动度 Overall cervical spine range of motion
		术前 Preoperative	术后 3个月 Postoperative at 3 months	术后 12个月 Postoperative at 12 months	末次随访 Last follow-up		术前 Preoperative	术后 3个月 Postoperative at 3 months	术后 12个月 Postoperative at 12 months	末次随访 Last follow-up
研究组 Study group	27	8.42±2.01	6.64±1.61	7.31±1.59	7.49±1.38		48.58±7.74	40.31±5.54	45.34±8.56	54.08±7.41
对照组 Control group	29	9.06±2.11	8.45±2.00	9.39±1.66	9.62±1.53		49.31±5.89	43.54±7.20	48.63±6.11	52.28±3.76
统计值 Statistic		时间效应F=6.633，P=0.002 交互效应F=2.892，P=0.058 组间效应F=28.901，P<0.001					时间效应F=31.482，P<0.001 交互效应F=2.120，P=0.100 组间效应F=1.716，P=0.196