Variable | Regression coefficient | Standard error | standardized regression coefficient | F value | P value |
Constant term | 461.12 | 478.74 | − | 0.86 | 0.35 |
Maternal age (years) | −9.76 | 4.19 | −0.27 | 6.79 | 0.01 |
Pregnancy induced hypertension syndrome | −197.87 | 48.37 | −0.34 | 17.51 | <0.05 |
Newborn gestational age (weeks) | 35.81 | 14.09 | 0.26 | 4.97 | <0.05 |
Start time of lactation stage II | −1.83 | 0.84 | −0.38 | 5.48 | <0.05 |