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１９９７年８月，对齐河县８２３名乡村医生的乙肝病毒表面抗原（ＨＢｓＡｇ）携带情况进行调查。结果：总阳性率为３．８９％（３２／８２３）；男性阳性率为４．１７％（２８／６７１），女性为２．６３％（４／１５２），男女差异有高度显著性（ｕ＝５３．０９，Ｐ＜０．
In August 1997, 823 village doctors in Qihe County were investigated for the presence of HBsAg. Results: The positive rate was 3.89% (32/823). The positive rate was 4.17% (28/671) in males and 2.63% (4/152) in females. There was a significant difference between males and females = 53.09, P <0.