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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