Table 3.
Stepwise multiple linear regression analysis for the effect of independent variables on rapid, tonic, and endurance contraction
| Variables | Rapid contraction | Tonic contraction | Endurance contraction | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| B | β | t | B | β | t | B | β | t | ||||
| (constant) | 38.668 | 24.032 | 28.967 | 24.350 | 25.298 | 24.770 | ||||||
| Age | -.298 | -.066 | -9.123*** | -.354 | -.107 | -14.860*** | -.310 | -.109 | -15.021*** | |||
|
BMI (kg/m2) |
.546 | .085 | 12.877*** | .366 | .078 | 11.826*** | .309 | .076 | 11.503*** | |||
| Parity | 1 | (ref.) | (ref.) | (ref.) | ||||||||
| 2 | 2.117 | .055 | 7.578*** | .905 | .032 | 4.438*** | .690 | .029 | 3.962*** | |||
| 3 | 2.553 | .025 | 3.650*** | 1.316 | .018 | 2.576* | 1.367 | .021 | 3.135** | |||
| ≥ 4 | ||||||||||||
| Education | ≤ 12 | (ref.) | (ref.) | (ref.) | ||||||||
| > 12 | 2.768 | .058 | 8.743*** | 3.141 | .090 | 13.586*** | 2.391 | .080 | 12.116*** | |||
| GWG | .046 | .019 | 2.758** | |||||||||
| NW | -1.199 | -.034 | -5.203*** | -.380 | -.015 | -2.258* | -.436 | -.020 | -2.964** | |||
| NOF | 1 | (ref.) | (ref.) | (ref.) | ||||||||
| ≥ 2 | ||||||||||||
| DM | CS | (ref.) | (ref.) | (ref.) | ||||||||
| NIVD | -10.639 | -.292 | -40.137*** | -8.169 | -.305 | -42.202*** | -7.445 | -.324 | -45.060*** | |||
| EP | -12.060 | -.216 | -30.245*** | -9.164 | -.224 | -31.470*** | -8.385 | -.239 | -33.729*** | |||
| FD | -20.159 | -.176 | -26.474*** | -15.238 | -.182 | -27.403*** | -13.342 | -.185 | -28.113*** | |||
| F | 281.255*** | 304.462*** | 304.302*** | |||||||||
| R2 | 0.106 | 0.114 | 0.125 | |||||||||
| adjR2 | 0.106 | 0.114 | 0.125 | |||||||||
BMI body mass index, GWG gestational weight gain, NW neonatal weight, NOF number of fetus, DM delivery mode, CS cesarean section, NIVD non-instrumental vaginal delivery, EP episiotomy, FD forceps delivery, B unstandardized beta, β standardized beta, t t test statistic
*p < .05
**p < .01
***p < .001