title: Psychometric properties of Functional Assessment of Cancer Therapy-Prostate (FACT-P) in Chinese patients with prostate cancer.
abstract: OBJECTIVE
  The aim of the study was to assess the validity, reliability and sensitivity of the FACT-P (version 4) in Chinese males with prostate cancer.
  
  
  METHODS
  Construct validity was assessed using Spearman's correlation test against the 12-item Short Form Health Survey (SF-12v2). Internal consistency and test-retest reliability were assessed using Cronbach's α coefficient and intra-class correlation coefficient, respectively. Sensitivity was determined by performing known-group comparisons by independent t test.
  
  
  RESULTS
  FACT-P subscale scores had a moderate correlation with the corresponding SF-12v2 domain score that conceptually measures the similar construct providing evidence for adequate construct validity. Internal consistency was acceptable (α: 0.687-0.900) for all subscales aside from the Prostate Cancer Subscale (α: 0.505) and Trial Outcome Index (α: 0.562). FACT-P subscale and total scores showed good test-retest reliability (range 0.753-0.913). All total scales and most of the subscales were sensitive in detecting differences between patients with different levels of functional impairment but not different cancer stages or levels of prostate-specific antigen.
  
  
  CONCLUSIONS
  The measure is a valid and reliable measure to assess the health-related quality of life of Chinese males with prostate cancer. The FACT-P is sensitive to detect difference between patients with varying functional status.
authors: Department of Family Medicine and Primary Care, University of Hong Kong, 3/F, Ap Lei Chau Clinic, 161 Ap Lei Chau Main Street, Ap Lei Chau, Hong Kong. carlosho@hku.hk.
authors: Carlos K H
authors: CK
authors: Wong
authors: Department of Family Medicine and Primary Care, University of Hong Kong, 3/F, Ap Lei Chau Clinic, 161 Ap Lei Chau Main Street, Ap Lei Chau, Hong Kong.
authors: Edmond P H
authors: EP
authors: Choi
authors: Division of Urology, Department of Surgery, University of Hong Kong, Pokfulam, Hong Kong.
authors: James H L
authors: JH
authors: Tsu
authors: Division of Urology, Department of Surgery, University of Hong Kong, Pokfulam, Hong Kong.
authors: Brian S H
authors: BS
authors: Ho
authors: Division of Urology, Department of Surgery, University of Hong Kong, Pokfulam, Hong Kong.
authors: Ada T L
authors: AT
authors: Ng
authors: Department of Family Medicine and Primary Care, University of Hong Kong, 3/F, Ap Lei Chau Clinic, 161 Ap Lei Chau Main Street, Ap Lei Chau, Hong Kong.
authors: W Y
authors: WY
authors: Chin
authors: Division of Urology, Department of Surgery, University of Hong Kong, Pokfulam, Hong Kong.
authors: M K
authors: MK
authors: Yiu
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People; D002681:China; D006306:Health Surveys; D006801:Humans; D008297:Male; D011471:Prostatic Neoplasms / Q000175:diagnosis* / Q000188:drug therapy / Q000523:psychology; D011594:Psychometrics / Q000379:methods*; D011788:Quality of Life; D015203:Reproducibility of Results; D018434:Sickness Impact Profile; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires
keywords: Chinese; Prostate cancer; Psychometrics; Quality of life; Reliability; Validity