age	n	alcohol-use	alcohol-frequency	marijuana-use	marijuana-frequency	cocaine-use	cocaine-frequency	crack-use	crack-frequency	...	oxycontin-use	oxycontin-frequency	tranquilizer-use	tranquilizer-frequency	stimulant-use	stimulant-frequency	meth-use	meth-frequency	sedative-use	sedative-frequency
0	12	2798	3.9	3.0	1.1	4.0	0.1	5.0	0.0	NaN	...	0.1	24.5	0.2	52.0	0.2	2.0	0.0	NaN	0.2	13.0
1	13	2757	8.5	6.0	3.4	15.0	0.1	1.0	0.0	3.0	...	0.1	41.0	0.3	25.5	0.3	4.0	0.1	5.0	0.1	19.0
2	14	2792	18.1	5.0	8.7	24.0	0.1	5.5	0.0	NaN	...	0.4	4.5	0.9	5.0	0.8	12.0	0.1	24.0	0.2	16.5
3	15	2956	29.2	6.0	14.5	25.0	0.5	4.0	0.1	9.5	...	0.8	3.0	2.0	4.5	1.5	6.0	0.3	10.5	0.4	30.0
4	16	3058	40.1	10.0	22.5	30.0	1.0	7.0	0.0	1.0	...	1.1	4.0	2.4	11.0	1.8	9.5	0.3	36.0	0.2	3.0

5 rows × 28 columns