Level | Means Difference across Flexion | Lower limit of 95% CI | Upper limit of 95% CI | Means Difference across Extension | Lower limit of 95% CI | Upper limit of 95% CI |
C2/3 | 8.67%* | 3.52% | 13.81% | −9.18%* | −18.50% | 0.14% |
C3/4 | 6.60%* | −0.46% | 13.66% | −0.69% | −10.30% | 8.92% |
C4/5 | 2.87% | −6.66% | 12.39% | −5.12%* | −13.30% | 3.05% |
C5/6 | 2.91% | −6.94% | 12.76% | −1.58% | −10.67% | 7.51% |
C6/7 | 5.02%* | 0.20% | 9.84% | −4.59% | −15.47% | 6.29% |
 | Means Difference across Protrusion | Lower limit of 95% CI | Upper limit of 95% CI | Means Difference across Retraction | Lower limit of 95% CI | Upper limit of 95% CI |
C2/3 | −11.73%* | 3.52% | 13.81% | 8.66%* | 3.52% | 13.81% |
C3/4 | −7.77%* | −16.60% | 1.06% | 5.28%* | 1.07% | 9.48% |
C4/5 | −9.13%* | −18.66% | 0.40% | 5.47%* | −0.50% | 11.43% |
C5/6 | −10.39% | −19.26% | − 1.52% | 3.82%* | −5.30% | 12.93% |
C6/7 | −9.41%* | −15.78% | −3.04% | 5.79%* | 1.43% | 10.15% |
 | Means Difference across Lateral flexion toward | Lower limit of 95% CI | Upper limit of 95% CI | Means Difference across Lateral flexion away | Lower limit of 95% CI | Upper limit of 95% CI |
C2/3 | −6.55%* | 3.52% | 13.81% | 6.73%* | 3.52% | 13.81% |
C3/4 | − 6.50%* | −13.32% | 0.32% | 6.78%* | 0.23% | 13.33% |
C4/5 | −5.50%* | −11.68% | 0.67% | 5.73%* | −1.58% | 13.05% |
C5/6 | −4.81%* | −11.65% | 2.03% | 4.48%* | −1.27% | 10.23% |
C6/7 | −5.52% | −9.49% | −1.55% | 3.71%* | −4.77% | 12.18% |