Psychometric properties of the RCMAS-2 in pediatric cancer patients

Purpose of the research: The Revised Children's Manifest Anxiety Scale, second edition (RCMAS-2) is widely used internationally to assess anxiety. However, there is little data regarding its validity for pediatric cancer patients. This study evaluated the psychometric properties of the RCMAS-2 in pediatric cancer patients. Methods and sample: This cross-sectional study included 370 pediatric cancer patients (aged 6-19 years) that were recruited from three medical centers between August 2008 and March 2011 in Taiwan. Reliability was evaluated by internal consistency. Confirmatory factor analysis was performed to examine the factor structure. Construct validity was examined by known-groups analyses. Key results: The internal consistency of the full scale was good (α = 0.90) but the scores of Physiological Anxiety subscale was low (α = 0.65). Using known-groups validity, significant differences in anxiety were observed between genders and between patients that were on and off treatment. The hypothesized three-factor model did not adequately fit (χ²/d.f = 2.4; p < 0.01, GFI = 0.80, CFI = 0.71, RMSEA = 0.06, SRMR = 0.01). Conclusions: The RCMAS-2 demonstrated reliability and validity for use with pediatric cancer patients aged 6 and 19 years. Further structure evaluation of the RCMAS-2 in pediatric oncology population is needed, and the scores of the Physiological Anxiety subscale should be interpreted with caution.