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Table 2 Outcome measures of included studies

From: Effectiveness of early interventions for substance-using adolescents: findings from a systematic review and meta-analysis

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)
  1. * Note: for Walton et al. (2010) and Damico, Miles, Stern & Meredith (2008) the results were already provided as effect sizes and standard errors.