表 2.

两组患者各个时间点SpO₂、BIS变化

Changes of SpO₂ and BIS changes in the two groups at each time point (Mean±SD)

Variable	Group	T1	T2	T3	T4
NVD: Patients without history of vaginal delivery; VD: Patients with history of vaginal delivery; SpO2: Peripheral Capillary Oxygen Saturation; BIS: Bispectral Index.
SpO2(%)
	NVD	99.9±0.375	100±0.00	100±0.00	99.98±0.13
	VD	100±0.00	100±0.00	100±0.00	100±0.00
BIS
	NVD	97.0±1.30	43.8±8.90	51.6±6.38	49.6±5.51
	VD	97.3±0.989	42.8±3.73	52.9±6.47	51.4±5.58