Table 6.

Estimation of γ relating to the covariates of gender and age class used for the multiple regression applied to answers about lifetime use of cigarettes, drunkenness, cannabis, tranquillizers or sedatives, all illicit substances except for cannabis mixed with alcohol

Questions	Variable	Males			Females	Age 15			Age 16			Age 17			Age 18			Age 19
		γ	SE	p <	γ	γ	SE	p <	γ	SE	p <	γ	SE	p <	γ	SE	p <	γ
Use of cigarettes	Dichotomous	0.05	0.05	0.29	REF	−0.02	0.07	0.82	−0.34	0.10	0.00	−0.36	0.10	0.00	−0.14	0.08	0.09	REF
	Ordinall	0.04	0.05	0.40	REF	−0.18	0.08	0.03	−0.14	0.08	0.08	−0.15	0.09	0.22	−0.11	0.08	0.22	REF
Drunkenness	Dichotomous	−0.17	0.07	0.01	REF	−0.03	0.10	0.76	0.01	0.11	0.95	−0.03	0.12	0.79	0.01	0.12	0.97	REF
	Ordinal	−0.07	0.06	0.24	REF	−0.04	0.12	0.75	0.08	0.09	0.39	0.11	0.10	0.25	0.07	0.10	0.46	REF
Cannabis	Dichotomous	−0.03	0.06	0.55	REF	−0.32	0.13	0.01	0.14	0.09	0.12	0.15	0.09	0.10	0.13	0.09	0.17	REF
	Ordinal	0.06	0.06	0.33	REF	−0.37	0.17	0.03	0.13	0.10	0.19	0.15	0.09	0.12	0.11	0.10	0.31	REF
Tranquillizers or sedatives	Dichotomous	0.15	0.20	0.45	REF	0.16	0.39	0.67	0.38	0.27	0.15	0.33	0.55	0.55	0.46	0.40	0.24	REF
All illicit drugs except cannabis mixed with alcohol	Dichotomous	0.29	0.10	0.00	REF	−0.97	0.27	0.00	−0.08	0.16	0.62	−0.13	0.17	0.45	−0.04	0.17	0.80	REF