Table 1.

Sociodemographics and risk factors for all 7,421 women included in the study and for women enrolled at the individual clinical sites

AllYangchengXinmiTonggu
n = 7,421n = 3,180n = 2,463n = 1,778
nCol %nCol %nCol %nCol %P
Age, y
 25–293274.41765.5130.51387.8<0.001
 30–391,95426.393229.343917.858332.8
 40–492,99440.41,09534.51,22149.667838.1
 50+2,14628.997730.779032.137921.3
Ethnicity
 Han7,41699.93,17799.92,463100.01,77699.80.242
 Hui40.130.100.010.1
 Other10.000.000.010.1
Education
 No formal schooling79710.71855.845218.41609.0<0.001
 Primary school only2,67936.11,10334.772029.285648.1
 Junior high school3,11842.01,47646.41,04442.459833.6
 Senior high school6969.434510.92229.01297.3
 College or University1311.8712.2251.0352.0
Occupation
 Worker3835.2692.21335.418110.2<0.001
 Farmer5,59175.32,83689.22,10085.365536.8
 Professional3204.31785.6793.2633.6
 Service provider1321.8441.4421.7462.6
 Office worker460.6160.5100.4201.1
 Other94912.8371.2994.081345.7
Number of house occupants
 0 to 32,18329.41,43945.337615.336820.7<0.001
 42,70836.51,20637.988836.061434.5
 51,18215.93069.651220.836420.5
 >51,34818.22297.268727.943224.3
Income
 0 to 3,0002,62635.41,46346.027010.989350.2<0.001
 3,001 to 5,0002,25830.491928.978832.055131.0
 5,001 to 6,0007049.51304.154122.0331.9
 6,001+1,79924.266821.083033.730116.9
 Missing340.500.0341.400.0
Smoking
 Never7,39299.63,17499.82,46099.91,75898.9<0.001
 Current250.330.130.1191.1
 Past40.130.100.010.0
Marital status
 Single30.030.100.000.0
 Married7,20597.13,08497.02,40297.51,71996.7<0.001
 Cohabitating70.100.050.220.1
 Divorced230.380.350.2100.6
 Separated60.110.010.140.2
 Widowed1772.4842.6502.0432.4
Number of pregnancies
 0 to 22,76937.31,56649.262525.457832.5<0.001
 32,25530.494829.878331.852429.5
 41,39118.747014.858223.633919.0
 5+1,00613.61966.247319.233719.0
Oral contraceptive use
 Never6,95793.82,92792.02,38897.01,64292.4<0.001
 Former1872.51564.970.3241.3
 Current370.5160.520.1191.1
 Missing2403.2812.6662.6935.2
Number of sexual partners (lifetime)
 16,47687.32,64083.02,29893.31,53886.5<0.001
 2+94512.754017.01656.724013.5
Number of sexual partners (last 6 months)
 077010.43159.92178.823813.4<0.001
 16,56988.52,80988.32,24091.01,52085.5
 2+821.1561.860.2201.1

NOTE: We noted challenges in recruitment of the oldest and youngest women, as older women were less willing to undergo screening and many of the younger women were transient and could not be located. Thus, our study population was biased toward women aged 35 to 50 years. Differences in the distributions between sites were tested for statistical significance using the Pearson χ2 test.