First report on the reliability and validity of speech handicap index in ...

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Reliability Both the internal consistency and test-retest reliability were measured in this study. Internal consistency and test-retest reliability were determined using Cronbach’s alpha coefficient and Spearman’s rank correlation coefficient, respectively. A high Cronbach’s alpha (>0.70) and Spearman’s correlation (rho > 0.60) value indicates adequate internal consistency and test-retest reliability. 35 Validity Construct and group validity were assessed by correlating speech item score with related constructs from the UWQOL questionnaire. ‘Bench marks’ for evaluating correlation values are >0.60: strong correlation; 0.40 to 0.60: moderate to substantial correlation;
of 87%. The median age of the group was 59.4 years (range: 35.9-80.0) with 36 males and 19 females. Detailed patient characteristics are provided in Table 1. Briefly, 17 (30.9%) patients had cancer of the oral cavity while 38 (69.1) patients had oropharyngeal cancer. Reliability Internal consistency The internal consistency reliability for Total SHI (mean of all 30 questions) and SHI speech domain (mean of 14 questions specific for evaluation of speech functions) as calculated by Cronbach’s alpha coefficient was 0.98 and 0.95, respectively. For SHI psycho-social domain (mean of 14 questions specific for evaluation of psycho-social function) Cronbach’s alpha coefficient was 0.98. (Table 2) Test-retest reliability Test-retest reliability of Total SHI and SHI speech domain as calculated by Spearman’s rank correlation coefficient were 0.92 and 0.88, respectively. For SHI psycho-social domain the coefficient was 0.89. (Table 3). Test-retest reliability of additional SHI question assessing overall speech quality was 0.78. Validity Construct validity To assess convergent construct validity and to determine the extent to which hypothetical relationships are confirmed 35 , we compared Total SHI values and values of speech and 8
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First report on the reliability and validity of speech handicap index in ...

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