Substance use: 3b. Alcohol use: average number of days using in last 6 months (skewed data)
Study	Intervention	Mean	SD	N
6 month
Drake 1998a	Treatment	56.80	56.40	75
Drake 1998a	Control	47.50	58.40	68
Essock 2006	Treatment	36.60	50.1	65
Essock 2006	Control	38.60	54.20	53
12 month
Drake 1998a	Treatment	59.10	53.30	75
Drake 1998a	Control	42.80	52.90	68
Essock 2006	Treatment	35.80	50.00	64
Essock 2006	Control	44.80	58.80	61
18 month
Drake 1998a	Treatment	53.80	57.80	75
Drake 1998a	Control	33.50	44.40	68
Essock 2006	Treatment	30.00	46.90	64
Essock 2006	Control	37.00	46.80	66
24 month
Drake 1998a	Treatment	52.40	55.90	75
Drake 1998a	Control	31.00	43.00	68
Essock 2006	Treatment	31.30	46.70	57
Essock 2006	Control	47.60	62.80	64
30 month
Drake 1998a	Treatment	54.80	60.90	75
Drake 1998a	Control	54.00	63.00	68
Essock 2006	Treatment	39.40	52.40	60
Essock 2006	Control	42.80	59.80	62
36 month
Drake 1998a	Treatment	46.40	53.60	75
Drake 1998a	Control	43.60	57.30	68
Essock 2006	Treatment	33.50	47.30	60
Essock 2006	Control	31.10	49.90	59