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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.