Table 1.

Mean levels of alcohol use by gender and age

		Females N = 11402		Males N = 9735		t-test of gender differences
	Range	Mean	SD	Mean	SD
Age 18
30-Day Alcohol Use	0–7	2.41	1.26	2.86	1.43	**
Heavy Drinking	0–5	1.59	0.96	2.12	1.24	**
Age 22
30-Day Alcohol Use	0–7	2.69	1.31	3.34	1.45	**
Heavy Drinking	0–5	1.59	0.94	2.25	1.59	**
Age 26
30-Day Alcohol Use	0–7	2.27	1.20	3.03	1.46	**
Heavy Drinking	0–5	1.28	0.67	1.79	1.06	**
Age 35
30-Day Alcohol Use	0–7	2.22	1.24	2.93	1.49	**
Heavy Drinking	0–5	1.23	0.63	1.69	1.05	**
Abuse Symptoms	0–9	0.30	0.04	0.48	0.43	**
Dependence Symptoms	0–5	0.47	0.74	0.77	0.97	**

^**Note: = p < 0.001