Table 2 Outcome measures of included studies
Study ID | Outcome | FU Group sizes /attrition rate | Intervention Results: Mean (SD)* | Control Results: Mean (SD) | Hedge’g and SE for Meta-Analysis |
|---|---|---|---|---|---|
1. Grenard et al,, 2007 [27] | Frequency alcohol Frequency marijuana Frequency other drugs Binge drinking Quantity drinks RAPI | 11 Experimental 7 Control 18% attrition | Not significant Not significant Not significant Not significant Not significant Not significant | Not significant Not significant Not significant Not significant Not significant Not significant | Unable to calculate |
2. Friedman et al., 2002 [28] | Frequency drug use Frequency alcohol Frequency illegal offenses Drug Selling Violent offences School problems | 110 Experimental 91 Control 16% attrition | 6.4 3.1 49.9 17.7 | n/a | Only for experimental group |
3. Stein et al., 2006 [29] | Frequency of drinking and driving Frequency of marijuana use and driving Frequency of driving with driver who had been drinking Frequency of driving with driver who had used marijuana | 59 Experimental, 45 Control | 0.43 (1.3) 6.25 (15.78) 4.68 (11.38) 19.07 (30.59) | 2.32 (4.18), 11.09 (21.4) 11.16 (13.85) 23.77 (30.94) | 0.64 (0.20) 0.26 (0.13) 0.52 (0.20) 0.15 ( 0.08) |
4. Bailey et al., 2004 [33] | Frequency of alcohol Quantity alcohol Binge drinking Hazardous drinking Risk-taking behaviors | Experimental: 17, Control: 17 | 1.49 (0.86), 1.72 (1.37), 1.57 (0.7), 4.79 (2.46), 2.39 (1.39) | 1.63 (0.98), 1.67 (1.28), 1.67 (1.03), 4.96 (2.83), 1.71 (1.21) | 0.15(0.08), 0.04(0.02), 0.11(0.05), 0.07(0.04), 0.50(0.27) |
5. Peterson et al., 2006 [34] | Binge drinking Frequency alcohol use Quantity alcohol Frequency marijuana Frequency days of illicit drug use summed days of illicit drug use RAPI: drug use consequences | 212 (69, 77, 65) (20% attrition) Intention to treat | Not significant Not significant 12.72 (11.54) 7.89 (10.32) 8.99 (13.05) Not significant | Not significant Not significant 12.39 (12.7) 7.69 (8.87) 10.63 (15.61) Not significant | 0.06 (0.03) 0.07(0.04) 0.15(0.08) |
6. Winters et al., in press [26] | Frequency alcohol Frequency marijuana # alcohol abuse symptoms #alcohol dependence symptoms # cannabis abuse symptoms #cannabis dependence symptoms PCS | Experimental 1(adolescent): 134, Experimental 2(parent and adolescent): 121, Control: 55 Attrition rate: 1.3% | 2.8 (4.4), 8.3 (14.3), 0.4 (1.1),0.7 (1.6), 4.3 (3.4), 1.0 (2.1), 12.1 (2.0) | 10.5 (11.8), 14.9 (18.1), 1.3 (1.9), 2.6 (3.9), 1.8 (2.6), 2.2 (3.0), 13.5 (3.1) | 1.01 (0.08), 0.42 (0.16), 0.64 (0.17), 0.75(0.17), 0.79(0.17), 0.50(0.16), 0.58(0.17) |
7. Walton et al., 2010 [31] | Alcohol use frequency/ Quantity of alcohol use Binge drinking Alcohol consequences Peer Aggression Violence | Experimental 1(Comp): 209, Experimental 2(Therapist: 209, Control: 208 Attrition rate: 15% Intention to Treat | 3MFU: 0.25 (0.22), 6MFU: 0.19 (0.23) 3MFU: 0.03 (0.22), 6MFU: 0.02 (0.23) 3MFU: 0.41 (0.23), 6MFU: 0.59 (0.25) 3MFU: 0.30 (0.10); 6MFU: 0.17 (0.11) 3MFU: 0.41(0.23); 6MFU: 0.08 (0.09) | 0.22(0.23), 0.03(0.23), 0.05(0.24), 0.24(0.11), 0.25(0.16) | |
8. Spirito et al., 2004 [30] | Frequency alcohol Quantity alcohol High/binge drinking drinking and driving | Experimental: 64, Control: 60 Attrition rate: 19% | 3.07 (4.25), 3.19 (2.56), 1.59 (2.97) Not significant | 4.15 (5.66), 3.36 (2.95), 2.58 (4.33) Not significant | 0.21(0.11), 0.06(0.03), 0.27(0.14) |
9. D’Amico, Miles, Stern & Meredith, 2008 [32] | Alcohol consequences Frequency alcohol Quantity of drinks Heavy drinking (+3 drinks) Marijuana | Experimental: 22, Control: 20 Attrition: 34% | n/a | n/a | 0.07 (0.14), 0.42 (0.63), 0.11 (0.42), 0.20 (0.35), 0.30 (0.19), 0.77 (0.26), 0.44 (0.56) |