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Table 4—

Predictive validity of the BIT Questionnaire scales in sample B

BIT Questionnaire scales and treatment choiceMeans ± SDtd.f.PCohen's d (95% CI)
Scale 1: “Fear of injections and self-testing”      
    Continue OADs 3.39 ± 2.85 3.29 447 <0.01 0.44 (0.20–0.69) 
    Change to subcutaneous insulin 2.26 ± 2.18     
Scale 2: “Expectations regarding positive insulin-related outcomes”      
    Continue OADs 7.15 ± 1.84 −5.20 447 <0.001 −0.66 (−0.91 to −0.42)* 
    Change to subcutaneous insulin 8.33 ± 1.71     
Scale 3: “Expected hardship from insulin therapy”      
    Continue OADs 4.36 ± 2.75 2.70 447 <0.01 0.35 (0.1–0.6) 
    Change to subcutaneous insulin 3.44 ± 2.58     
Scale 4: “Stigmatization by insulin injections”      
    Continue OADs 4.48 ± 2.53 3.41 446 <0.01 0.45 (0.20–0.69) 
    Change to subcutaneous insulin 3.41 ± 2.26     
Scale 5: “Fear of hypoglycemia”      
    Continue OADs 6.42 ± 2.65 3.66 447 <0.001 0.44 (0.20–0.69) 
    Change to subcutaneous insulin 5.20 ± 2.90     
BIT Questionnaire sum score      
    Continue OADs 4.36 ± 1.53 5.87 447 <0.001 0.76 (0.51–1.01) 
    Change to subcutaneous insulin 3.27 ± 1.34     
BIT Questionnaire scales and treatment choiceMeans ± SDtd.f.PCohen's d (95% CI)
Scale 1: “Fear of injections and self-testing”      
    Continue OADs 3.39 ± 2.85 3.29 447 <0.01 0.44 (0.20–0.69) 
    Change to subcutaneous insulin 2.26 ± 2.18     
Scale 2: “Expectations regarding positive insulin-related outcomes”      
    Continue OADs 7.15 ± 1.84 −5.20 447 <0.001 −0.66 (−0.91 to −0.42)* 
    Change to subcutaneous insulin 8.33 ± 1.71     
Scale 3: “Expected hardship from insulin therapy”      
    Continue OADs 4.36 ± 2.75 2.70 447 <0.01 0.35 (0.1–0.6) 
    Change to subcutaneous insulin 3.44 ± 2.58     
Scale 4: “Stigmatization by insulin injections”      
    Continue OADs 4.48 ± 2.53 3.41 446 <0.01 0.45 (0.20–0.69) 
    Change to subcutaneous insulin 3.41 ± 2.26     
Scale 5: “Fear of hypoglycemia”      
    Continue OADs 6.42 ± 2.65 3.66 447 <0.001 0.44 (0.20–0.69) 
    Change to subcutaneous insulin 5.20 ± 2.90     
BIT Questionnaire sum score      
    Continue OADs 4.36 ± 1.53 5.87 447 <0.001 0.76 (0.51–1.01) 
    Change to subcutaneous insulin 3.27 ± 1.34     

Comparision of patients who accepted versus refused insulin treatment in a theoretical treatment choice scenario. Patients who wanted to continue with OADs: n = 371 vs. patients who were willing to change to subcutaneous insulin: n = 77–78. P value = two-tailed significance.

*

d is negative due to the inversion of the items of this scale.

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