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Table 1 Psychometric properties. Proportion of correct answers, loglinear Rasch model fit, and differential item functioning (DIF) in the 30-item CTG test

From: Development of a written assessment for a national interprofessional cardiotocography education program

Item Blueprint domain Pilot test participants
Proportion of correct answers in percent
n = 118
CTG course participants
Proportion of correct answers in percent
n = 1679
Loglinear Rasch DIF
     Observed Expected P-value P-value
Item1 Indication 81.4 97.7 0.350 0.346 - *
Item2 Classification 78.8 91.8 0.737 0.685 - -
Item3 Classification 82.2 92.9 0.795 0.751 - -
Item4 Classification 80.5 97.0 0.524 0.530 - -
Item5 Equipment 94.1 99.3 0.134 0.348 - -
Item6 Management 94.1 99.5 0.537 0.348 - -
Item7 Indication 74.6 93.9 0.466 0.372 - *
Item8 Classification 73.3 89.7 0.296 0.341 - *
Item9 Classification 57.6 70.0 0.153 0.242 - -
Item10 Management 86.4 92.1 0.278 0.342 - -
Item11 Physiology 72.9 95.6 0.371 0.345 - -
Item12 Physiology 80.5 96.7 0.633 0.414 - -
Item13 Classification 72.9 96.4 0.583 0.610 - -
Item14 Management 83.1 97.3 0.636 0.704 - -
Item15 Management 85.6 97.1 0.440 0.346 - -
Item16 Physiology 76.3 96.3 0.331 0.345 - -
Item17 Physiology 93.2 97.3 0.160 0.346 - -
Item18 Physiology 72.0 85.0 0.327 0.338 - +
Item19 Physiology 80.2 96.8 0.442 0.416 - +
Item20 Classification 77.1 95.7 0.724 0.646 - -
Item21 Classification 82.2 94.9 0.572 0.596 - -
Item22 Physiology 91.5 98.5 0.615 0.517 - -
Item23 Management 87.3 98.5 0.608 0.546 - -
Item24 Management 88.1 98.5 0.552 0.347 - -
Item25 Classification 71.2 93.5 0.481 0.451 - +
Item26 Physiology 60.2 98.5 0.445 0.347 - -
Item27 Management 93.2 96.9 0.479 0.346 - -
Item28 Management 66.1 79.0 0.159 0.218 - *+
Item29 Classification 66.9 91.5 0.543 0.466 - -
Item30 Management 74.6 98.9 0.723 0.500 - -
  1. - Non-significant P-values
  2. * P-values that indicate DIF concerning profession
  3. + P-values that indicate DIF concerning regions