Table 5. Comparison with the National ESPAD®Italy 2015 study.

Risk behaviors				Two-sample proportion test
	National (%)	P&P (%)	Computerized (%)	National vs P&P		National vs Computerized
	N = 17257	N = 784	N = 771	z	p-value	z	p-value
Lifetime cigarette use	60.8	59.3	57.8	0.83	0.41	1.69	0.09
Lifetime alcohol use	87.0	88.4	84.1	-1.17	0.24	2.30	0.02
Last year alcohol use	79.2	82.1	76.3	-1.95	0.05	1.93	0.05
Last month alcohol use	61.8	62.3	58.0	-0.27	0.79	2.13	0.03
Binge drinking during last month	35.5	36.0	39.6	-0.31	0.76	-2.35	0.02
Lifetime intoxication from drinking alcohol	41.7	45.4	41.2	-2.01	0.04	0.33	0.74
Last year intoxication from drinking alcohol	31.1	34.3	31.1	-1.89	0.06	-0.05	0.96
Last month intoxication from drinking alcohol	13.6	15.5	14.2	-1.54	0.12	-0.46	0.64
Lifetime cannabis use	32.5	34.5	31.2	-1.19	0.24	0.72	0.47
Last year cannabis use	26.6	28.2	26.1	-0.95	0.34	0.29	0.77
Last month cannabis use	17.4	18.3	16.4	-0.71	0.48	0.70	0.49
Lifetime ecstasy use	2.8	2.8	2.3	-0.05	0.96	0.73	0.47
Last year ecstasy use	2.2	2.4	1.7	-0.38	0.70	1.00	0.32
Lifetime amphetamines use	2.0	1.9	1.8	0.19	0.85	0.37	0.71
Last year amphetamines use	1.6	1.7	1.6	-0.06	0.95	0.14	0.88
Lifetime methamphetamines use	1.8	2.2	1.5	-0.77	0.44	0.69	0.49
Last year methamphetamines use	1.5	1.8	1.2	-0.76	0.45	0.61	0.54
Lifetime cocaine use	3.7	3.1	2.6	0.95	0.34	1.59	0.11
Last year cocaine use	2.7	2.6	2.4	0.31	0.76	0.64	0.52
Lifetime crack use	2.3	2.4	1.3	-0.18	0.86	1.83	0.07
Last year crack use	1.6	2.2	0.9	-1.19	0.23	1.51	0.13
Lifetime inhalants use	2.7	3.1	2.9	-0.59	0.55	-0.26	0.79
Last year inhalants use	1.7	1.8	1.2	-0.29	0.77	1.02	0.31
Last month inhalants use	1.3	1.5	0.8	-0.45	0.65	1.33	0.18
Lifetime tranquillizers or sedatives (without a doctor’s prescription) use	5.3	4.7	5.1	0.73	0.47	0.25	0.80
Lifetime LSD or some other hallucinogens use	2.9	3.1	2.0	-0.35	0.72	1.45	0.15
Lifetime heroin use	1.8	1.4	1.2	0.76	0.45	1.20	0.23
Lifetime magic mushrooms use	2.7	3.1	1.8	-0.70	0.49	1.38	0.17
Lifetime GHB use	1.1	1.1	0.5	-6.00	0.95	1.52	0.13
Lifetime anabolic steroids use	1.5	2.0	1.3	-1.36	0.17	0.26	0.79
Lifetime use of alcohol together with pills (medicaments) in order to get high	3.3	3.3	2.6	-0.03	0.97	1.03	0.30
Lifetime energy drink use	56.8	56.3	55.6	0.31	0.75	0.67	0.50
Last year energy drink use	42.1	43.0	39.8	-0.51	0.60	1.20	0.23
Last month energy drink use	28.4	28.7	27.2	-0.20	0.84	0.66	0.51
Lifetime use of energy drinks and alcohol during a single session	29.8	34.4	34.1	-2.72	0.01	-2.47	0.01
Last year use of energy drinks and alcohol during a single session	23.5	27.8	26.2	-2.76	0.01	-1.69	0.09
Last month use of energy drinks and alcohol during a single session	15.6	17.2	17.0	-1.18	0.24	-1.02	0.31
Lifetime use of cigarette, alcohol or any illicit drug	91.8	92.5	90.0	-0.66	0.51	1.60	0.11