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Table 1 Factor loadings after varimax rotation of the three components extracted and results of test-retest reliability for each DDQ item

From: Screening preschool children with toothache: validation of the Brazilian version of the Dental Discomfort Questionnaire

DDQ items(a) Factor 1–‘Eating and sleeping problems’ Factor 2–‘Earache problems’ Factor 3–‘Problems with brushing teeth’ Weighted-kappa coefficient (95% Confidence Interval)(b)
Cries during meals 0.79 -0.26 -0.09 0.88 (0.74-1.00)
Reaches for the cheek while eating 0.77 0.24 0.06 0.75 (0.55-0.96)
Puts away something nice to eat 0.70 0.01 0.16 0.74 (0.52-0.96)
Suddenly cries at night 0.60 0.24 0.27 0.84 (0.69-0.98)
Chews on one side 0.59 0.28 0.17 0.97 (0.92-1.00)
Has problems chewing 0.53 0.20 0.36 0.77 (0.61-0.94)
Bites with molars instead of front teeth 0.47 -0.08 0.30 0.68 (0.49-0.88)
Has earache during the day 0.04 0.86 0.07 0.80 (0.59-1.00)
Has earache at night 0.05 0.75 0.07 0.94 (0.84-1.00)
Has earache during eating 0.22 0.72 0.07 0.94 (0.83-1.00)
Has problems with brushing lower teeth 0.07 0.09 0.87 0.86 (0.71-1.00)
Has problems with brushing upper teeth 0.26 0.11 0.84 0.75 (0.57-0.93)
Eigenvalues 4.08 1.62 1.28  
% of variance 34.04 13.52 10.67  
Cronbach’s alpha coefficient 0.81 0.75 0.78  
  1. (a)Items ordered by factor analysis. (b)Test-retest reliability.
  2. The numbers in bold refer to the highest factor loading for each item.