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Table 4 Correlation between Item and Scale and Cronbach's Alpha of Proxy Scales When Each Item is Deleted

From: Do proxies reflect patients' health concerns about urinary incontinence and gait problems?

  N of proxies Item-scale correlation Cronbach's alpha*
pSF-12 PCS Items    
   Self-report health (poor/fair/good/very good/excellent) 118 0.57 0.58
   Limitation in vigorous activities? 118 0.55 0.62
   Limitation in moderate activities? 118 0.81 0.47
   Limitation in climbing several flights of stairs 118 0.63 0.55
   Limitation in dressing yourself 118 0.26 0.64
   Limited kind of activities/work 117 0.79 0.54
    Overall = 0.62
pUI Scale Items    
   Worry about getting to toilet on time 28 0.72 0.84
   Have to be careful about sitting/standing 27 0.77 0.84
   Worry where the toilets are in new places 28 0.72 0.84
   Don't feel free to leave home 27 0.69 0.84
   Worry about others smelling urine on me 28 0.84 0.83
   Frequent trip to toilet is important 28 0.67 0.85
   Plan details in advance 28 0.70 0.85
   Hard to get good sleep 27 0.43 0.87
   Watch what/how much to drink 28 0.54 0.86
   Limited choice of clothing 28 0.72 0.85
    Overall = 0.86
FES Items    
   Cleaning the house 69 0.79 0.93
   Getting dressed 81 0.83 0.92
   Preparing simple meals 68 0.84 0.92
   Taking a bath/shower 79 0.83 0.93
   Simple shopping 62 0.84 0.93
   Getting in and out of a chair 81 0.79 0.93
   Going up/down stairs 74 0.69 0.93
   Walking around the neighborhood 72 0.82 0.93
   Reaching into cabinets or closets 76 0.75 0.93
   Going to answer the telephone 71 0.77 0.93
    Overall = 0.93
  1. * Cronbach's alpha of scales when each item is delete