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Table 9 Item characteristics, ordering of response categories, and DIF of the 12-item short version HLS19-SF12

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-SF12

ConQuest

RUMM

Infitw MNSQ

CI

T- value

Item estimate

SE

Ordered

DIFa

lb

ub

HC

F

2

 

…to find information on treatments of illnesses that concern you?

1.06

0.86

1.14

0.8

0.214

0.083

yes

none

U

6

x

…to understand the instruction leaflets that come with your medicine?

1.06

0.87

1.13

0.9

0.042

0.075

yes

Hg,b

J

10

 

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

1.03

0.87

1.13

0.5

0.527

0.083

yes

none

A

15

x

…to call an ambulance in a medical emergency?

0.98

0.82

1.18

-0.2

-0.425

0.077

no

none

DP

F

18

x

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

1.04

0.87

1.13

0.7

0.673

0.073

yes

none

U

23

x

…to understand information about recommended health screenings or examinations?

0.94

0.86

1.14

-0.9

-0.352

0.083

yes

none

J

26

x

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

0.99

0.88

1.12

-0.2

0.097

0.078

yes

none

A

30

x

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

1.00

0.87

1.13

0.0

0.065

0.081

yes

none

HP

F

33

x

…to find information about activities that are good for your mental health and well-being?

1.08

0.88

1.12

1.3

-0.587

0.077

yes

none

U

39

x

…to understand information in the mass media on how to improve your health?

0.98

0.87

1.13

-0.2

0.212

0.081

yes

none

J

43

x

…to judge which everyday habits affect your health?

0.95

0.86

1.14

-0.7

-0.482

0.083

yes

none

A

45

x

…to join a sports club or exercise group if you want to be physically active?

1.08

0.87

1.13

1.1

0.015

0.068

yes

LTc

  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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