Table 1.
Regression coefficients (B) and P values from GEEs on amplitudes of right-sided muscle activity during the active straight leg raise (ASLR), with Side (ipsilateral vs. contralateral) and Condition (without vs. with weight added above the ankle) as factors
| Amplitude (μV) | Intercept | Side | Condition | Interaction | ||||
|---|---|---|---|---|---|---|---|---|
| B | P a | B b | P a | B c | P a | B d | P a | |
| Psoas | 6.41 | 0.00 | −0.08 | 0.98 | 3.98 | 0.00 | ||
| Iliacus | 1.44 | 0.00 | 38.66 | 0.00 | 0.15 | 0.00 | 6.61 | 0.00 |
| Rectus femoris | 0.74 | 0.00 | 6.99 | 0.00 | 0.28 | 0.00 | 3.41 | 0.00 |
| Adductor longus | 0.88 | 0.00 | 2.01 | 0.00 | 0.23 | 0.00 | 1.43 | 0.00 |
Non-significant interactions have been left out
Note that GEE calculates regression equations, and, for instance, the first line reads as: psoas activity equals 6.41 + (in conditions with weight) 3.98 (and some non-significant components)
aFor the model effects (which may be different from P values for specific parameterizations)
bFor the ipsilateral side (i.e. right side ASLR)
cFor the condition with weight added
dIpsilateral, with weight