title: Prediction on liver fibrosis using different APRI thresholds when patient age is a categorical marker in patients with chronic hepatitis B.
abstract: BACKGROUND
  Patient age as a predictive variable plays an important role in some indices and models. It was hypothesized that patient age might be a categorical marker.
  
  
  METHODS
  We collected the data of 623 CHB patients with liver biopsies. Two-hundred fifty-two patients could provide the duration of HBsAg-positive.
  
  
  RESULTS
  The positive correlation between duration of HBsAg-positive and patient age was statistically significant (r = 0.487, P < 0.001). When the cutoff value of patient age was 33.5 y, the best accuracy for liver fibrosis could be obtained. If we could use APRI threshold value of 0.11 for patients with age ≤ 35 and 0.18 for those > 35 y, we could correctly identify 110 CHB patients with insignificant fibrosis which were free of liver biopsy. For all CHB patients based on the APRI threshold of 0.11, 75 patients could be safely predicted as insignificant fibrosis.
  
  
  CONCLUSIONS
  Many more CHB patients with insignificant fibrosis could be free of liver biopsy when we used different APRI threshold values based on patient age, especially in patients with > 35 y. The study indicated that more attention should be paid to the influence of patient age on fibrosis.
authors.affiliation: School of Public Health, China Medical University, Shenyang, China. liuhbabc@163.com
authors.forename: Hong-Bo
authors.initials: HB
authors.lastname: Liu
authors.forename: Jian-Ping
authors.initials: JP
authors.lastname: Zhou
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xiao-Hui
authors.initials: XH
authors.lastname: Lv
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001219:Aspartate Aminotransferases / Q000378:metabolism*; D001792:Blood Platelets / Q000378:metabolism*; D005260:Female; D019694:Hepatitis B, Chronic / Q000150:complications*; D006801:Humans; D007753:Laboratories; D008099:Liver / Q000473:pathology; D008103:Liver Cirrhosis / Q000097:blood / Q000175:diagnosis* / Q000201:enzymology / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012372:ROC Curve; D012189:Retrospective Studies; D013997:Time Factors; D055815:Young Adult
chemical_list: D001219:Aspartate Aminotransferases