Table 1.

Baseline physiological values used to configure the virtual obstetric subjects.15, 16, 17^,21, 22, 23 BMI 24/35/40/45/50, body mass index 24/35/40/45/50 kg m⁻², respectively.

	BMI24	BMI24 and labour	BMI35	BMI35 and labour	BMI40	BMI40 and labour	BMI45	BMI45 and labour	BMI50	BMI50 and labour
Weight (kg)	75	75	94	94	108	108	122	122	135	135
Tidal volume (ml)	630	850	690	900	700	840	710	900	730	950
Ventilatory frequency (bpm)	16	23	16	23	16	23	16	23	19	23
Functional residual capacity (ml)	1600	1600	1600	1600	1600	1600	1600	1600	1600	1600
Deadspace (%)	140	140	140	140	140	140	140	140	140	140
Shunt fraction (%)	9	9	13	13	15	15	17	17	18	18
Cardiac output (L min−1)	6.9	8.3	8.0	9.6	8.6	9.8	8.8	10.0	9.0	10.5
Heart rate (beats min−1)	90	100	90	100	90	100	90	100	90	100
Total blood volume (L)	6.75	6.75	6.82	6.82	7.88	7.88	8.91	8.91	9.85	9.85
Haemoglobin concentration (g dl−1)	11.3	11.3	11.3	11.3	11.3	11.3	11.3	11.3	11.3	11.3
Oxygen consumption (ml min−1)	270	322	338	404	388	464	439	524	450	619
Respiratory quotient	0.88	0.88	0.88	0.88	0.88	0.88	0.88	0.88	0.88	0.88