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Table 4 Reliability of five-item structured self-report in dichotomous and Likert scales

From: Estimates of adherence to treatment of vivax malaria

Parameters

Scales

Item

(i-1)

(i-2)

(i-3)

(i-4)

(i-5)

Item-to-total correlation

Dichotomous

0.59

0.55

0.30

0.09

−0.07

Likert

0.72

0.58

0.38

0.26

0.51

Likert dichotomized

0.70

0.61

0.26

0.20

0.35

Overall dichotomous

0.65

0.58

0.28

0.15

0.18

Cronbach’s alpha when item was excluded

Dichotomous (0.508)*

0.22

0.24

0.43

0.58

0.60

Likert (0.717)*

0.55

0.62

0.71

0.75

0.67

Likert dichotomized (0.657)*

0.46

0.50

0.66

0.7

0.63

Overall dichotomous (0.599)*

0.37

0.40

0.58

0.65

0.62

  1. *Cronbach’s alpha original values.