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Table 5 Differential item functioning according to age group, sex and disease type (n = 1286)

From: Dimensionality and psychometric analysis of DLQI in a Brazilian population

Item Sex Age Disease type
q1 F > M; p < 0.001 p = 0.492 SYM > P + S > PSY; p < 0.001
q2 F > M; p < 0.001 Y > A > O; p < 0.001 P + S > PSY; p < 0.001
q3 F > M; p < 0.001 Y > A > O; p < 0.001 P + S > PSY; p < 0.001
q4 F > M; p < 0.001 Y > O; p < 0.001 P + S > PSY > SYM; p < 0.001
q5 F > M; p < 0.001 Y > A > O; p < 0.001 P + S > PSY; p < 0.001
q6 F > M; p = 0.003 Y > A > O; p < 0.001 P + S > PSY > SYM; p = 0.044
q7 p = 0.055 A > Y > O; p = 0.004 P + S > PSY > SYM; p < 0.001
q8 F > M; p < 0.001 Y > A > O; p = 0.048 P + S > SYM > PSY; p < 0.001
q9 p = 0.300 Y > A > O; p < 0.001 P + S > SYM > PSY; p < 0.001
q10 F > M; p < 0.001 Y > A > O; p = 0.012 P + S > PSY; p < 0.001
DLQI F > M; p < 0.001 Y > A > O; p = 0.004 P + S > PSY; p < 0.001
  1. F female, M male, O age > 60 years, A age between 30 and 60 years, Y = age < 30 years; PSY psychological / social domain, SYM physical / symptomatic domain; P + S PSY + SYM
  2. Post hoc test: Sidak sequential method