Abstract:
:Assessing bowel function (BF) in prostate cancer can help determine therapeutic trade-offs. We determined the components of BF commonly assessed in prostate cancer studies as an initial step in creating an item bank for clinical and research application. We analyzed six archived data sets representing 4,246 men with prostate cancer. Thirty-one items from validated instruments were available for analysis. Items were classified into domains (diarrhea, rectal urgency, pain, bleeding, bother/distress, and other) then subjected to conventional psychometric and item response theory (IRT) analyses. Items fit the IRT model if the ratio between observed and expected item variance was between 0.60 and 1.40. Four of 31 items had inadequate fit in at least one analysis. Poorly fitting items included bleeding (2), rectal urgency (1), and bother/distress (1). A fifth item assessing hemorrhoids was poorly correlated with other items. Our analyses supported four related components of BF: diarrhea, rectal urgency, pain, and bother/distress.
journal_name
Eval Health Profjournal_title
Evaluation & the health professionsauthors
Eton DT,Lai JS,Cella D,Reeve BB,Talcott JA,Clark JA,McPherson CP,Litwin MS,Moinpour CMdoi
10.1177/0163278705275338subject
Has Abstractpub_date
2005-06-01 00:00:00pages
142-59issue
2eissn
0163-2787issn
1552-3918pii
28/2/142journal_volume
28pub_type
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