FIGURE LEGENDS
Figure 1 . A longitudinal analysis with repeated measures of SI was performed using a linear mixed-effects model. The change in SI during labour and postpartum was the primary outcome. The crude trends and the 95% CI of the multilevel regression model across repeated measures for SI, HR, and SBP are shown. The mean raw values of SI, HR and SBP are also presented.
Figure 2. An adjusted linear mixed-effects model was performed by maternal age (older than 35 years), haemoglobin level, cervical dilation, and nulliparity. For continuous (except for cervical dilation) variables, we stratified and entered them as dummy indicators in the multilevel model. Additionally, the models were fitted for each component of the SI (HR and SBP).