Table 1.

Baseline of two groups

	Case group	Control group	P value
Age, y, average (standard difference)	34.28 (5.93)	34.47 (3.73)	0.790
Gravity*, average (standard difference)	2.36 (1.42)	2.84 (1.59)	0.027
Parity*, average (standard difference)	0.44 (0.61)	0.97 (0.78)	0.000
History of miscarriage* average (standard difference)	1.01 (1.33)	0.22 (0.66)	0.000
No. of smoker, n (%)	0	0	–
No. of consumer of alcohol beverage, n (%)	2 (2.1%)	3 (3%)	1.000
No. of coffee drinker, n (%)	8 (8.4%)	10 (10%)	0.807

^*Indicates the items of significant differences.