Correlation between the Crohn's disease activity and Harvey-Bradshaw indices in assessing Crohn's disease severity

Clin Gastroenterol Hepatol. 2010 Apr;8(4):357-63. doi: 10.1016/j.cgh.2010.01.001. Epub 2010 Jan 21.


Background & aims: Clinical trials of Crohn's disease generally use the Crohn's Disease Activity Index to assess disease activity; these calculations are complex, time-consuming, and impracticable. We investigated whether a simpler tool, the Harvey-Bradshaw Index, was equally effective in assessing disease severity.

Methods: Crohn's Disease Activity and Harvey-Bradshaw Index scores were collected from 2 large multicenter Crohn's disease studies. The PEGylated antibody fragment evaluation in Crohn's disease: safety and efficacy (PRECiSE) 1 and 2 trials assessed efficacy and tolerability of certolizumab pegol (PEGylated, humanized, Fab' fragment of an antitumor necrosis factor alpha antibody). PRECiSE 1 and 2 data were analyzed to determine if results from the Crohn's Disease Activity Index correlated with those from the Harvey-Bradshaw Index criteria for defining response and remission.

Results: Analysis of almost 1000 data pairs showed a positive correlation between scores. The correlation between the indices for pooled data from PRECiSE 1 and PRECiSE 2 was 0.800 (Spearman correlation coefficient). The correlations between indices for the PRECiSE 1 or PRECiSE 2 were 20.698 and 0.716, respectively (Kronecker product variance). A 3-point change in the Harvey-Bradshaw Index score corresponded to a 100-point change in the Crohn's Disease Activity Index (clinical response); scores < or =4 points corresponded to a Crohn's Disease Activity Index score < or =150 points (clinical remission).

Conclusions: Results from the Crohn's Disease Activity Index correlate with those from the Harvey-Bradshaw Index; use of the Harvey-Bradshaw Index might permit simpler Crohn's disease activity assessment in long-term clinical trials, and facilitate standardized disease activity measurements and cross-center comparisons.

Publication types

  • Multicenter Study
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Animals
  • Antibodies, Monoclonal, Humanized
  • Certolizumab Pegol
  • Crohn Disease / drug therapy
  • Crohn Disease / pathology*
  • Humans
  • Immunoglobulin Fab Fragments / therapeutic use
  • Immunologic Factors / therapeutic use
  • Middle Aged
  • Polyethylene Glycols / therapeutic use
  • Severity of Illness Index*
  • Young Adult


  • Antibodies, Monoclonal, Humanized
  • Immunoglobulin Fab Fragments
  • Immunologic Factors
  • Polyethylene Glycols
  • Certolizumab Pegol