Table 4

Summary results of convergent and discriminant validity tests

Item-Discriminant Validity

Item-Internal Consistency

Range of Correlations⁴

Test success⁵

Factors

N¹

Factors

Range of Correlations²

# Success/Total³

1

2

3

4

Level 1

Level 2

1

7

0.558–0.762

7/7

---

0.376–0.465

0.456–0.549

0.293–.0477

1/21

20/21

2

4

0.604–0.708

4/4

0.410–0.442

---

0.343–0.442

0.406–0.426

0/12

12/12

3

5

0.535–0.684

5/5

0.406–0.554

0.287–0.406

---

0.362–0.483

1/15

14/15

4

3

0.550–0.700

3/3

0.436–0.453

0.314–0.491

0.427–0.504

---

0/9

9/9

¹ Number of items, ² Range of correlations between items and hypothesized factor corrected for overlap, ³ Number of correlations exceeding the 0.40 standard/total number of correlations, ⁴ Range of correlations between items and other factors, ⁵ Successful discriminant validity tests. Level 1: Item-factor correlation is higher for hypothesized scale than competing scales. Level 2: Item-scale correlation is significantly higher for hypothesized scale than competing scales. The default significance level for comparing two correlations is two standard errors. The standard error of a correlation coefficient is approximately equal to 1 divided by the square root of the sample size.

Paleologou et al. BMC Health Services Research 2006 6:118   doi:10.1186/1472-6963-6-118