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Table 3 Exploration of discriminatory validity using DMT status (pre-test) (N = 50)

From: Applying the theory of planned behaviour to multiple sclerosis patients’ decisions on disease modifying therapy – questionnaire concept and validation

PBMS

DMT status

 

Domains

pre-test

RCT

pos-

p-value

 

Sub-domains

without /with

without /with

sible range

pre

RCT

1: Attitude

2.1 / 4.6

2.4 / 4.1

0-9

<.01

<.01

 

a: expectations regarding outcomes

1.4 / 2.0

1.5 / 1.9

0-3

<.01

<.01

 

b: values of expected outcomes

1.4 / 2.2

1.5 / 2.1

0-3

<.01

<.01

2: Social norm

1.2 / 1.8

1.5 / 2.4

0-9

.23

<.01

 

a: assumed attitudes of important others

1.2 / 2.0

1.5 / 2.2

0-3

<.01

<.01

 

b: motivation to comply with these norms

1.0 / .9

1.0 / 1.1

0-3

<.01

.34

3: Control beliefs

1.6 / 4.7

2.1 / 4.1

0-9

<.01

<.01

 

a: assumed facilitators or barriers

1.0 / 2.1

1.2 / 1.9

0-3

<.01

<.01

 

b: perceived power of these factors

1.4 / 2.2

1.5 / 2.0

0-3

<.01

<.01

Intention estimate

4.8 / 11.1

6.0 / 10.1

0-27

<.01

<.01

  1. PBMS results are provided as means separately for groups using or not using DMT (disease modifying treatment), pre-test participants of (N = 50) and participants included in the randomized controlled trial (RCTN = 177). P values refer to unpaired t-tests comparing the two groups.