A nested case-control study of maternal-neonatal transmission of hepatitis B virus in a Chinese population

Table 1 Comparison of baseline characteristics between cases and controls (Hunan, China, 2005-2006)

Research factor	Cases number (%)	Controls number (%)
Education of mother
< College	81 (57.45)	57 (40.43)
> College	60 (42.55)	84 (59.57)
Income (yuan/mo)
< 1500	90 (63.83)	92 (65.25)
> 1500	51 (36.17)	49 (34.75)
First-degree family history
No	69 (48.94)	107 (75.89)
Yes	72 (51.06)	34 (24.11)
Liver function
Normal	99 (70.21)	117 (82.98)
Abnormal	42 (29.79)	24 (17.02)
Systematic treatment
No	119 (84.40)	94 (66.67)
Yes	22 (15.60)	47 (33.33)
EHP
No	127 (90.07)	133 (94.33)
Yes	14 (9.93)	8 (5.67)
Intrahepatic cholestasis
No	101 (71.63)	121 (85.82)
Yes	40 (28.37)	20 (14.18)
Premature rupture of membranes
No	99 (70.21)	119 (84.40)
Yes	42 (29.79)	22 (15.60)
Anti-hepatitis B immunoglobulin injection
No	100 (70.92)	68 (48.23)
Yes	41 (29.08)	73 (51.77)
Fetal distress
No	68 (48.23)	91 (64.54)
Yes	73 (51.77)	50 (35.46)

EHP: Edema hypertension proteinuria syndrome.