Table 3.

Distributions of anti-rubella antibodies in pregnant women by socio-demographic characteristics

		N, % (95% CI)
	N	Negative (< 8 IU/ml)	equivocal (8- < 11 IU/ml)	Positive (≥11 IU/ml)	Protective (≥10 IU/ml)	P
Birth place
Beijing	164	23 (14.0%; 9.5%–20.2%)	10 (6.1%; 3.3%–10.9%)	131 (79.9%; 73.1%–85.3%)	132 (80.5%; 73.8%–85.8%)	0.16
Other city	160	15 (9.4%; 5.8%–14.9%)	9 (5.6%; 3.0%–10.3%)	136 (85.0%; 78.7%–89.7%)	138 (86.3%; 80.1%–90.7%)
Residence place
Urban	131	15 (11.5%; 7.0%–18.0%)	7 (5.3%; 2.6%–10.6%)	109 (83.2%; 75.9%–88.6%)	111 (84.7%; 77.6%–89.9%)	0.58
Rural	193	23 (11.9%; 8.1%–17.2%)	12 (6.2; 3.6%–10.6%)	158 (81.9%; 75.8%–86.7%)	159 (82.4%; 76.4%–87.1%)
Education
Junior	39	4 (10.3%; 4.1%–23.6%)	0 (0; 0–9.0%)	35 (89.7%; 76.4%–95.9%)	35 (89.7%; 76.4%–95.9%)	0.40
Senior	86	7 (8.1%; 4.0%–15.9%)	7 (8.1%; 4.0%–15.9%)	72 (83.7%; 74.5%–90.0%)	73 (84.9%; 75.8%–90.9%)
College or higher	199	27 (13.6%; 9.5%–19.0%)	12 (6.0%; 3.5%–10.2%)	160 (80.4%; 74.3%–85.3%)	162 (81.4%; 75.4%–86.2%)
Occupation
Unemployed	86	7 (8.1%; 4.0%–15.9%)	7 (8.1%; 4.0%–15.9%)	72 (83.7%; 74.5%–90.0%)	73 (84.9%; 75.8%–90.9%)	0.65
Employed	238	31 (13.0%; 9.3%–17.9%)	12 (5.0%; 2.9%–8.6%)	195 (81.9%; 76.6%–86.3%)	197 (82.8%; 77.5%–87.0%)