Table 2 ΔSDA at different levels and with different numbers of fused levels
Level | Numbers of fused levels | Total | |||||
|---|---|---|---|---|---|---|---|
L2/3 | L3/4 | L4/5 | 1 | 2 | ≥3 | ||
Total | 15 | 47 | 112 | 61 | 59 | 54 | 174 |
preSDA (°) | 4.1 ± 4.5 | 5.4 ± 4.3 | 5.4 ± 4.6 | 5.2 ± 4.5 | 5.9 ± 4.9 | 4.6 ± 4.0 | 5.3 ± 5.0 |
postSDA (°) | 8.7 ± 2.2 | 8.3 ± 3.2 | 9.6 ± 3.8 | 9.5 ± 3.7 | 8.8 ± 3.6 | 9.1 ± 3.3 | 9.1 ± 3.6 |
ΔSDA (°) | 4.6 ± 4.3 | 2.9 ± 3.9 | 4.2 ± 5.2 | 4.3 ± 5.2 | 2.8 ± 5.2 | 4.5 ± 3.7 | 3.9 ± 4.8 |
95% CI (°) | 2.3–7.0 | 1.8–4.1 | 3.2–5.1 | 3.0–5.6 | 1.5–4.2 | 3.5–5.5 | 3.1–4.6 |
Minimum value (°) | −3.2 | −7.2 | −8.1 | −4.8 | − 8.1 | −5.4 | −8.1 |
Maximum value (°) | 11.3 | 10.0 | 17.2 | 16.3 | 17.2 | 13.3 | 17.2 |
F value* | 1.266 | 2.098 | NA | ||||
P value† | 0.285 | 0.126 | NA | ||||