Rouse Peter C, Veldhuijzen Van Zanten Jet J J C S, Ntoumanis Nikos, Metsios George S, Yu Chen-an, Kitas George D, Duda Joan L
Department for Health, University of Bath, Bath, BA2 7AY, UK.
School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, UK.
Arthritis Res Ther. 2015 Nov 5;17:312. doi: 10.1186/s13075-015-0827-7.
People with rheumatoid arthritis (RA) frequently suffer from compromised physical and psychological health, however, little is known about positive indicators of health, due to a lack of validated outcome measures. This study aims to validate a clinically relevant outcome measure of positive psychological well-being for people with RA. The first study examined the reliability and factorial validity of the Subjective Vitality Scale (SVS), whilst study 2 tested the instruments convergent validity.
In study 1, National Rheumatoid Arthritis Society members (N = 333; M age = 59.82 years SD = 11.00) completed a postal questionnaire. For study 2, participants (N = 106; M age = 56 years, SD = 12 years) were those recruited to a randomized control trial comparing two physical activity interventions who completed a range of health-related questionnaires.
The SVS had a high level of internal consistency (α = .93, Rho = .92). Confirmatory factor analysis supported the uni-dimensional factor structure of the questionnaire among RA patients [χ = 1327 (10), CFI = 1.0, SRMSR = .01 and RMSEA = .00 (.00 - .08)]. Support for the scales convergent validity was revealed by significant (p < .05) relationships, in expected directions, with health related quality of life (r = .59), physical function (r = .58), feelings of fatigue (r = -.70), anxiety (r = -.57) and depression (r = -.73).
Results from two studies have provided support for the internal consistency, factorial structure and convergent validity of the Subjective Vitality Scale. Researchers and healthcare providers may employ this clinically relevant, freely available and brief assessment with the confidence that it is a valid and reliable measure of positive psychological well-being for RA patients.
ClinicalTrials.gov ISRCTN04121489 . Registered 5 September 2012.
类风湿性关节炎（RA）患者经常遭受身心健康受损的困扰，然而，由于缺乏经过验证的结果测量方法，对于健康的积极指标知之甚少。本研究旨在验证一种针对RA患者的具有临床相关性的积极心理健康结果测量方法。第一项研究检验了主观活力量表（SVS）的信度和因子效度，而第二项研究测试了该工具的收敛效度。
在第一项研究中，全国类风湿关节炎协会成员（N = 333；平均年龄 = 59.82岁，标准差 = 11.00）完成了一份邮寄问卷。在第二项研究中，参与者（N = 106；平均年龄 = 56岁，标准差 = 12岁）是被招募到一项比较两种体育活动干预措施的随机对照试验中的人员，他们完成了一系列与健康相关的问卷。
SVS具有较高的内部一致性（α = 0.93，Rho = 0.92）。验证性因子分析支持了该问卷在RA患者中的单维因子结构[χ = 1327（10），CFI = 1.0，SRMSR = 0.01，RMSEA = 0.00（0.00 - 0.08）]。与健康相关生活质量（r = 0.59）、身体功能（r = 0.58）、疲劳感（r = -0.70）、焦虑（r = -0.57）和抑郁（r = -0.73）之间在预期方向上存在显著（p < 0.05）关系，这表明该量表具有收敛效度。
两项研究结果为SVS的内部一致性、因子结构和收敛效度提供了支持。研究人员和医疗保健提供者可以放心地使用这种具有临床相关性、免费可得且简短的评估方法，因为它是一种对RA患者积极心理健康的有效且可靠的测量方法。
ClinicalTrials.gov ISRCTN04121489。于2012年9月5日注册。
