Table 2.
Estimates (95% confidence intervals) of regression coefficients for the effect of follower load on overall, regional, and individual level sagittal plane angles by test condition. P-values are shown for difference of estimates from the Intact condition and for significance of slope (change with follower load).
| Constant (°) | Slope (°/kN) | p-values | |||
|---|---|---|---|---|---|
| Constant vs. Intact | Slope vs. Intact | Slope vs. 0 | |||
| Overall (T1-T12) angle | |||||
| Intact | 59.7 (52.9 – 66.4) | 2.20 (−1.84 – 6.24) | - | - | 0.285 |
| Stiffened | 65.1 (58.4 – 71.8) | −0.80 (−4.84 – 3.23) | < 0.001 | 0.302 | 0.696 |
| No Ribs | 63.9 (57.1 – 70.7) | 4.16 (−0.51 – 8.83) | < 0.001 | 0.534 | 0.081 |
|
Regional angles T1-T4 angle | |||||
| Intact | 17.8 (13.9 – 21.8) | 4.77 (1.36 – 8.19) | - | - | 0.006 |
| Stiffened | 19.5 (15.6 – 23.4) | 4.84 (1.43 – 8.25) | 0.071 | 0.979 | 0.005 |
| No Ribs | 19.1 (15.1 – 23.1) | 9.54 (5.59 – 13.48) | 0.205 | 0.074 | < 0.001 |
| T4-T8 angle | |||||
| Intact | 25.8 (20.8 – 30.7) | 1.56 (−1.81 – 4.92) | - | - | 0.364 |
| Stiffened | 26.6 (21.6 – 31.5) | 0.89 (−2.48 – 4.25) | 0.386 | 0.783 | 0.605 |
| No Ribs | 27.8 (22.8 – 32.8) | 2.94 (−0.95 – 6.84) | 0.035 | 0.598 | 0.139 |
| T8-T12 angle | |||||
| Intact | 16.1 (9.0 – 23.1) | −4.13 (−7.60 – −0.67) | - | - | 0.019 |
| Stiffened | 19.0 (12.0 – 26.1) | −6.53 (−10.00 – −3.07) | 0.001 | 0.337 | < 0.001 |
| No Ribs | 17.1 (10.1 – 24.2) | −8.74 (−12.49 – −5.00) | 0.262 | 0.076 | < 0.001 |
|
Individual Angles T1-T2 angle | |||||
| Intact | 3.17 (0.37 – 5.96) | 3.18 (0.71 – 5.65) | - | - | 0.012 |
| Stiffened | 4.35 (1.54 – 7.16) | 3.97 (1.41 – 6.52) | 0.084 | 0.664 | 0.002 |
| No Ribs | 4.68 (1.85 – 7.50) | 5.88 (3.13 – 8.63) | 0.03 | 0.152 | < 0.001 |
| T4-T5 angle | |||||
| Intact | 6.29 (4.18 – 8.40) | 0.34 (−2.00 – 2.68) | - | - | 0.777 |
| Stiffened | 5.56 (3.45 – 7.67) | 0.19 (−2.15 – 2.52) | 0.252 | 0.928 | 0.876 |
| No Ribs | 5.93 (3.76 – 8.11) | 1.02 (−1.70 – 3.74) | 0.606 | 0.709 | 0.461 |
| T8-T9 angle | |||||
| Intact | 8.37 (5.85 – 10.90) | −0.20 (−3.05 – 2.64) | - | - | 0.888 |
| Stiffened | 8.87 (6.34 – 11.40) | −0.18 (−3.04 – 2.67) | 0.516 | 0.992 | 0.9 |
| No Ribs | 8.59 (6.06 – 11.12) | −0.86 (−3.93 – 2.21) | 0.776 | 0.759 | 0.584 |
| T11-T12 angle | |||||
| Intact | −1.25 (−4.94 – 2.43) | −2.92 (−6.28 – 0.44) | - | - | 0.089 |
| Stiffened | −0.17 (−3.85 – 3.52) | −5.35 (−8.60 – −2.10) | 0.218 | 0.308 | 0.001 |
| No Ribs | 0.77 (−2.92 – 4.46) | −8.15 (−11.81 – −4.48) | 0.023 | 0.039 | < 0.001 |