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Table 4 Comparison of the difference in the SF-12 scores between including and excluding the items displaying DIF between the groups of each variable-related DIF

From: Differential item functioning (DIF) of SF-12 and Q-LES-Q-SF items among french substance users

Variable-related DIF

∆ Score SF-12a

P value

Mean (SD)

Sex (item MH1)

 

0.98

 Male (n =103)

0.05 (3.0)

 

 Female (n=21)

0.03 (3.1)

Age (item MH2)

 

0.73

 Age < 36 years (n =72)

-0.64 (2.9)

 

 Age ≥ 36 years (n=52)

-0.45 (3.1

 Age (item MH4)

 

0.93

 Age < 36 years (n =72)

0.96 (9.4)

 

 Age ≥ 36 years (n=52)

1.12 (9.9)

  1. a∆ Score SF-12 = (score including all 12 items) – (score excluding the item displaying DIF)
  2. (Scores were on a 0–100 standardized scale)