Social and obstetric risk factors of antenatal depression: A cross-sectional study in China

Table 1 Sociodemographic and obstetric variables of pregnant women in China (n = 44220)

Variables		Frequency (n)	Percentage (%)
Sociodemographic variables
Age (years)	18-24	1764	4.0
	24-29	16671	37.7
	≥ 30	25785	58.3
	Missing data	0	0
Residence	Temporary	23857	54.0
	Permanent	20363	46.0
	Missing data	0	0
Employment status	Unemployed	220	0.5
	Employed	43302	97.9
	Missing data	698	1.6
Education (years)	≤ 12	7479	16.9
	> 12	36738	83.1
	Missing data	3	0
Economic status	Low	279	0.6
	Moderate	25338	57.3
	High	18440	41.7
	Missing data	163	0.4
History of mental disorders	Yes	463	1.0
	No	43666	98.8
	Missing data	91	0.2
Obstetric variables
Trimester of pregnancy	First	14740	33.3
	Second	14879	33.6
	Third	14601	33.0
	Missing data	0	0
Gravidity	1	19271	43.6
	≥ 2	22832	51.6
	Missing data	2117	4.8
Parity	0	25650	58.0
	≥ 1	16449	37.2
	Missing data	2121	4.8
Planned pregnancy	Yes	31963	72.3
	No	12092	27.3
	Missing data	165	0.4
Mode of conception	Natural	41146	93.0
	Artificial	2913	6.6
	Missing data	161	0.4
Pre-pregnancy screening	Yes	25127	56.8
	No	18924	42.8
	Missing data	169	0.4