Table 3 The mean cervical activity measured during follow-up (mean ± SD)

Postoperative 3 months

24.7 ± 3.2

25.9 ± 2.7

24.4 ± 4.3

24.9 ± 3.8

51.2 ± 6.2

50.7 ± 5.8

Postoperative 6 months

37.5 ± 2.0^a

39.3 ± 1.8^a

39.2 ± 2.1^a

40.1 ± 2.0^a

70.6 ± 2.6^a

69.8 ± 2.5^a

Final follow-up

37.9 ± 1.8^b

40.0 ± 1.5^b

40.1 ± 1.3^b

40.9 ± 1.7^b

70.8 ± 2.1^b

70.4 ± 1.3^b

^aP

< 0.001

< 0.001

< 0.001

< 0.001

< 0.001

< 0.001

^bP

0.25

0.23

0.08

0.15

0.58

0.33