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Table 8 Item characteristics, ordering of response categories, and DIF of the 12-item short version HLS19-Q12

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- Q12

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?

1.00

0.86

1.14

0.1

-0.410

0.077

yes

LSg,b

U

7

x

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

0.99

0.86

1.14

-0.1

0.239

0.078

yes

none

J

10

 

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

1.07

0.87

1.13

1.1

0.542

0.083

yes

none

A

16

x

…to act on advice from your doctor or pharmacist?

0.93

0.84

1.16

-0.9

-0.542

0.086

no

none

DP

F

18

x

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

1.06

0.87

1.13

0.9

0.676

0.074

yes

none

U

23

x

…to understand information about recommended health screenings or examinations?

0.93

0.86

1.14

-1.0

-0.334

0.083

yes

none

J

24

x

…to judge if information on unhealthy habits, such as smoking, low physical activity or drinking too much alcohol, are reliable?

0.99

0.87

1.13

-0.1

-0.231

0.078

yes

none

A

31

x

…to decide how you can protect yourself from illness using information from the mass media?

u1.14

0.87

1.13

u2.1

0.693

0.079

yes

Full-CInb

HP

F

32

x

…to find information on healthy lifestyles such as physical exercise, healthy food, or nutrition?

1.02

0.87

1.13

0.3

-0.405

0.074

yes

none

U

37

x

…to understand advice concerning your health from family or friends?

0.95

0.85

1.15

-0.7

-0.347

0.089

yes

none

J

42

x

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

1.08

0.86

1.14

1.2

0.084

0.075

yes

Full-CI

A

44

x

…to make decisions to improve your health and well-being?

1.00

0.87

1.13

0.0

0.035

0.077

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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