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

Table 1 Uniform Differential Item Functioning (DIF) in the Q-LES-Q-SF items according to age, education level, sex and type of substance dependence

	Age		Education level		Sex		Type of substance dependence
	MS total DIF	P	MS total DIF	P	MS total DIF	P	MS total DIF	P
Items from the Q-LES-Q-SF
1. Physical health	0.003	0.948	0.044	0.795	0.264	0.524	1.370	0.154
2. Mood	0.047	0.811	0.142	0.686	0.016	0.891	0.437	0.467
3. Work	0.328	0.599	0.012	0.922	3.662	0.075	2.473	0.140
4. Household activities	8.782	0.008^a	0.774	0.425	0.088	0.793	1.360	0.299
5. Social relationships	0.020	0.877	1.264	0.208	0.004	0.948	1.543	0.165
6. Family relationships	2.366	0.136	0.090	0.775	0.251	0.628	11.12	0.001^a
7. Leisure time activities	0.279	0.591	0.004	0.952	0.391	0.537	0.424	0.518
8. Ability to function in daily life	0.505	0.523	1.403	0.288	0.031	0.872	0.917	0.381
9. Sexual drive, interest and/or performance	0.172	0.710	0.119	0.762	4.975	0.044^a	1.381	0.290
10. Economic status	3.203	0.099	0.949	0.349	0.460	0.530	1.544	0.242
11. Living/ housing situation	2.072	0.165	0.005	0.949	1.010	0.379	1.677	0.245
12. Ability to get around physically without feeling dizzy or falling	0.145	0.681	0.317	0.560	0.002	0.961	1.410	0.212
13. Vision in terms of ability to do work or hobbies	1.318	0.301	0.022	0.894	0.198	0.690	2.108	0.192
14. Overall sense of well-being	0.080	0.725	0.001	0.99	0.050	0.777	0.133	0.653

ISSN: 1477-7525