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Table 3 Psychometric properties of the remaining items in the revised AKO (after omitting item numbers 2, 8, and 10) at scale level

From: Psychometric evaluation of a short-form version of the Swedish “Attitudes to and Knowledge of Oral Health” questionnaire

 

ATa

IPb

KIc

Suggested cutoff

Psychometric testing

  Ceiling effects (%)

1.3%

2.0%

39.9%

 < 20

  Floor effects (%)

0.2%

0.2%

0

 < 20

  Internal consistency (Cronbach’s α)

0.460

0.760

0.869

 > 0.7

Confirmatory factor analysis

  χ2 (df)

66.372 (62)

-

-

Nonsignificant

  Comparative fit index

0.998

-

-

 > 0.9

  Tucker-Lewis index

0.997

-

-

 > 0.9

  Root-mean square error of Approximation

0.011 (0.00–0.028)

-

-

 < 0.08

  Standardized Root Mean Squared Residual (SRMR)

0.042

-

-

 < 0.08

  Average Variance Extracted

0.22

0.47

0.65

 > 0.5

  Composite Reliability

0.44

0.78

0.92

 > 0.6

  Item separation reliability from Rasch

1.00

0.96

0.95

 > 0.7

  Item separation index from Rasch

18.17

4.69

4.37

 > 2

  Person separation reliability from Rasch

0.70

0.71

0.54

 > 0.7

  Person separation index from Rasch

2.00

2.03

1.08

 > 2

  1. AKO (Attitudes to and Knowledge of Oral health questionnaire)
  2. *p < 0.001
  3. a Attitudes to oral hygiene (Items 1, 3, 4)
  4. b Implementation Possibilities (Items 5, 6, 7, 9)
  5. c Knowledge of Importance (Items 11–16)