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Table 7 Item characteristics, ordering of response categories, and DIF of the 12-item short version HLS19-YP12

From: Developing the HLS19-YP12 for measuring health literacy in young people: a latent trait analysis using Rasch modelling and confirmatory factor analysis

HD

CD

Item no

RW in HLS19

Item:On a scale from very difficult to very easy, how easy would you say it is:

1-dimensional analysis HLS19- YP12

ConQuest

RUMM

Infitw MNSQ

CI

T- value

Item estimate

SE

Ordered

DIFa

lb

ub

HC

F

4

x

…to find out where to get professional help when you are ill?

1.07

0.86

1.14

1.0

-0.525

0.077

yes

none

U

7

x

…to understand information about what to do in a medical emergency?

0.99

0.86

1.14

-0.1

0.101

0.078

yes

none

J

10

 

…to judge the advantages and disadvantages of different treatment options?

0.98

0.87

1.13

-0.3

0.422

0.084

yes

none

A

13

x

…to use information your doctor gives to you to make decisions about your illness?

0.93

0.86

1.14

-1.0

-0.283

0.087

yes

none

DP

F

18

x

…to find information on how to handle mental health problems?

1.09

0.87

1.13

1.3

0.537

0.074

yes

none

U

23

x

…to understand information about recommended health screenings or examinations?

0.92

0.86

1.14

-1.2

-0.481

0.083

yes

none

J

26

x

…to judge which vaccinations, you or your family may need?

0.97

0.87

1.13

-0.5

-0.058

0.079

yes

none

A

30

x

…to decide how you can protect yourself from illness using advice from family or friends?

1.04

0.87

1.13

0.5

-0.089

0.081

yes

none

HP

F

36

x

…to find information about how to promote health at work, at school or in the neighborhood?

0.97

0.87

1.13

-0.4

0.057

0.084

yes

none

U

38

 

…to understand information on food packaging?

1.02

0.87

1.13

0.4

-0.224

0.076

yes

none

J

41

x

…to judge how your neighborhood may affect your health and well-being?

1.10

0.87

1.13

1.4

0.775

0.077

yes

none

A

46

x

…to influence your living conditions that affect your health and well-being?

0.99

0.86

1.14

-0.1

-0.233

0.085

yes

none

  1. LS Level in the society, LT Long-term illness, H Health status, HD Health domains, CD Cognitive domains, HC Health care, DP Disease prevention, HP Health promotion, RW Rewording, F Find, U Understand, J Judge, A Apply, lb Lower bound, ub Upper bound, CI Confidence interval, T-value Similar to the z standardized fit statistics in unidimensional Rasch analyses, MNSQ Mean square value, SE Standard Error
  2. w weighted fit MNSQ, unidimensional model using ConQuest 5
  3. u A t-value > 1.96 indicates a poorly fitting item in terms of under-discrimination relative to the Rasch model
  4. DIF: differential item functioning; aBonferroni-adjusted 5% has been used to assist detecting possible significant deviations due to DIF; b uniform DIF; c non-uniform DIF; g Graphical only; Full-CI: Class Interval main effect applied to age, gender, education, economic deprivation, level in society, long-term illness and health status; nb Full-CI significant at 5%-level, but not significant when adjusted for Bonferroni 5%-level; Ordered: "no" refers to an item with disordered response categories
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BMC Health Services Research

ISSN: 1472-6963

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