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. Author manuscript; available in PMC: 2014 Mar 13.
Published in final edited form as: J Nurs Meas. 2013;21(1):96–109. doi: 10.1891/1061-3749.21.1.96

Table 4.

Convergent Validity: Internal Consistency Statistics for Each of the Four Subscales

Perceived
Vulnerability		 Perceived
Severity		 Perceived
Benefits		 Perceived
Barriers
Number of Items 5 6 8 9
Number of Subjects with Complete Data 167 166 183 169
Reliability
   Cronbach’s alpha (α) .80 .89 .85 .92
   Average inter-item correlation .44 .56 .41 .53
   Range of inter-item correlations .27–.63 .41–.76 .04–.89 .14–.91
   α increase if item deleted .80 (Q9) .89 (Q15) .88 (Q4)
.86 (Q7)		 .93 (Q26)
.93 (Q27)
Factor Analysis
   Number of eigenvalues >1 1 1 3 2
   % variance explained by 1st factor 45.49% 57.48% 47.07% 58.90%
   Number of components indicated by MAP test 1 1 1 1
   Number of factors indicated by PA 1 1 3 2
   KMO Measure of Sampling Adequacy .75 .88 .82 .88
   Bartlett’s Test of Sphericity x2 = 268.60,
df = 10,
p < .001		 x2 = 529.00,
df = 1 5,
p < .001		 x2 = 881.84,
df = 28,
p < .001		 x2 = 1304.65,
df = 36,
p < .001