Physical and ultrasonographic abnormalities in advanced cases of schistosomiasis japonica, stratified by age group (n = 198).

From the 215 cases with advanced schistosomiasis japonica, 17 observations were excluded owing to missing values.aAnalysis of variance was performed for means of hemoglobin (F value = 8.03, Pt-test was performed for comparisons between age groups. The mean of hemoglobin of those aged ≥60 years was significantly different from those aged 30–44 years and those aged 45–59 years at a level of 5%, and there were no statistical significance between those aged 30–44 years old and those aged 45–59 years at a level of 5%.bThe mean of inner diameter of portal vein was 3.9 mm (SD = 2.9 mm) larger than the normal value (10.6–11.1 mm for those aged ≥30 years; t = 18.92, PF = 0.32, P = 0.726).cHepatitis B surface antigen. Significant difference between age groups for general association (PdSpecific antibody to hepatitis B core antigen. Significant difference between age groups for general association (PeHepatitis B antigen appearing during weeks 3 to 6 indicates an acute active infection at the peak infectious period, and means that the patient is infectious. Persistence of this virological marker beyond 10 weeks shows progression to chronic infection and infectiousness.fA linear association between hepatomegaly and age (P