TABLE 1.

Characteristics of women who enrolled in the pregnancy monitoring system according to gestational hypertension, China, 1993 to 1996

Characteristics	Gestational hypertension group (n = 19 267)		Non‐gestational hypertension group (n = 182 217)		p
	n a	% b	n a	% b
Age at pregnancy (years, mean [SD])	25.03 (3.35)		24.86 (3.19)		<.001
Body mass index (kg/m2, mean [SD])	20.78 (2.25)		20.50 (2.09)		<.001
Primiparous	16 393	85.08	151 015	82.88	<.001
Han ethnic group	19 123	99.25	180 887	99.27	.786
Folic acid use	10 313	53.53	95 246	52.27	.001
Anemia during pregnancy	12 714	80.45	116 494	79.56	.009
Education
High school or higher	2019	10.48	20 126	11.05	.055
Junior high school	11 490	59.64	108 184	59.37
Primary school or lower	5758	29.89	53 907	29.58
Occupation
Farmer	11 039	57.29	108 008	59.27	<.001
Factory worker	5477	28.43	49 702	27.28
Other	2751	14.28	24 507	13.45

Abbreviation: SD, standard deviation.

^a Values for some characteristics may not be equal to total numbers of gestational hypertension or non‐gestational hypertension groups because of missing values.

^b Values for some characteristics may not be equal to 100 because of rounding.