Table 1.

Comparison of general conditions between the SCH group and the control group

	SCH group (n = 78)	Control (n = 74)	P value
Maternal age, year*	30.46 ± 4.64	31.26 ± 4.55	0.288
BMI kg/m2*	22.75 ± 2.31	23.39 ± 3.19	0.156
Gravidity, n*	2.10 ± 0.93	2.20 ± 1.26	0.580
Parity, n*	0.55 ± 0.55	0.51 ± 0.63	0.693
Gestational age, week*	19.56 ± 3.39	19.19 ± 3.35	0.163

*Data are expressed as the means ± standard deviations using Student’s t test. p < 0.05 was considered statistically significance

BMI body mass index