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Table 3 Item parameter estimates and fit statistics of GRM

From: Evaluation of psychometric properties and differential item functioning of 8-item Child Perceptions Questionnaires using item response theory

  a b1 b2 b3 b4 S-χ2 df p
RSF:8
 Oral symptoms
  1. Mouth sores 0.45 −2.54 0.08 8.01 12.18 61.4 60 0.426
  2. Bad breath 0.53 −3.01 −0.68 4.31 7.29 75.8 77 0.517
 Functional limitations
  3. Trouble sleeping 1.17 0.00 1.58 3.16 4.41 68.7 59 0.181
  4. Difficult to say any words 1.11 0.81 2.65 4.87 6.33 46.2 45 0.423
 Emotional well-being
  5. Concerned with other people think 1.40 −0.34 0.90 2.68 3.76 61.9 59 0.372
  6. Upset 1.98 0.07 1.24 2.77 3.81 51.4 45 0.236
 Social well-being
  7. Argued with other children or your family 1.65 0.06 1.24 2.95 4.00 62.9 47 0.061
  8. Teased/called names by other children 1.34 0.17 1.55 2.83 3.69 57.9 57 0.445
ISF:8
 Oral symptoms
  1. Bad breath 0.53 −3.01 −0.68 4.31 7.29 75.8 77 0.517
  2. Food caught between/in teeth 0.63 −5.39 −2.78 2.48 7.7 62.4 61 0.424
 Functional limitations
  3. Difficult to bite or chew food like apples, corn on the cob or steak 0.96 0.14 2.29 4.77 6.47 56.5 53 0.344
  4. Difficult to drink or eat hot or cold foods 0.94 0.35 1.97 4.09 5.1 72.6 59 0.110
 Emotional well-being
  5. Irritable/frustrated 1.84 −0.13 1.00 2.34 3.35 89.1 58 0.005
  6. Upset 1.98 0.07 1.24 2.77 3.81 51.4 45 0.236
 Social well-being
  7. Avoided smiling/laughing when around other children 1.58 0.66 1.87 2.97 3.9 59.3 49 0.149
  8. Asked questions about your teeth, lips, jaws or mouth by other children 0.95 0.18 2.3 4.91 6.07 56.5 51 0.276