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Table 5 Threshold values of the dysfunctional response categories before and after the removal of the misfitting items

From: The importance of rating scales in measuring patient-reported outcomes

Questionnaire (Question number)

Threshold values (All items)

Threshold values (After removing misfitting items)

IVI (1–19)

−1.45, −1.72, 0.03, 0.72, 2.43

−1.50, −1.73, 0.03, 0.73, 2.48

ADVS (1bc–19bc except 6 and 7bc)

−0.94, −1.00, −0.20, 2.14

−0.60, −1.21, −0.32, 2.13

HVAT (1ab to 10ab)

−0.52, 0.25, −0.04, −1.04, −0.36, 0.26, −0.12, −0.38, 1.96

−0.83, 0.14, −0.17, −0.95, −0.61, 0.33, 0.06, −0.31, 2.35

NEIVFQ (20–25, A12, A13)

−0.07, −0.51, 0.26, 0.33

–0.03, −0.70, 0.11, 0.62

  1. Item removal has little impact on values and does not repair disordered thresholds.