TABLE 6.

Comparison of plasma concentration between twins.

Parameters	The first of the twins in Group III (n = 5)	The second of the twins in Group III (n = 5)	The first of the twins in Group IV (n = 7)	The second of the twins in Group IV (n = 7)	p-Value
Etomidate
UV, ng/mL	400.23 ± 90.87	345.00 ± 148.39	346.30 ± 138.41	283.85 ± 123.95	0.939
UA, ng/mL	239.16 ± 93.26	164.80 ± 51.04	167.32 ± 46.32	163.69 ± 41.12	0.599
UV/MA ratio	0.78 ± 0.13	0.66 ± 0.23	0.67 ± 0.29	0.53 ± 0.21	0.533
UA/UV ratio	0.60 ± 0.18	0.54 ± 0.26	0.55 ± 0.28	0.65 ± 0.26	0.897
Remifentanil
UV, ng/mL	1.74 ± 1.06	1.47 ± 0.88	1.60 ± 0.50	1.53 ± 0.39	0.496
UA, ng/mL	1.00 ± 1.08	0.82 ± 1.05	0.51 ± 0.41	0.48 ± 0.44	0.131
UV/MA ratio	0.42 ± 0.18	0.37 ± 0.17	0.52 ± 0.23	0.50 ± 0.21	0.338
UA/UV ratio	0.47 ± 0.29	0.45 ± 0.41	0.37 ± 0.29	0.35 ± 0.33	0.867
Rocuronium bromide
UV, ng/mL	1.13 ± 0.78	0.83 ± 0.68	0.73 ± 0.56	0.60 ± 0.29	0.482
UA, ng/mL	058 ± 0.36	0.43 ± 0.36	0.35 ± 0.23	0.34 ± 0.13	0.453
UV/MA ratio	0.20 ± 0.10	0.14 ± 0.09	0.16 ± 0.18	0.10 ± 0.06	0.550
UA/UV ratio	0.54 ± 0.14	0.52 ± 0.06	0.55 ± 0.17	0.60 ± 0.18	0.774

MA, maternal arterial, UA, umbilical arterial, UV, umbilical venous.