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. Author manuscript; available in PMC: 2019 Nov 14.
Published in final edited form as: Am J Addict. 2015 Sep 11;24(7):637–645. doi: 10.1111/ajad.12278

Table 1.

Baseline characteristics of the study sample that participated in the extended follow up, compared to those that did not.

Variable “In study” group1 (n=2613) “Not in study” group1 (n=2194) p-value2
Gender 0.657
Male 207 (79.3%) 170 (77.6)
Female 54 (20.7%) 49 (22.4)
Race/Ethnicity 0.544
Hispanic 119 (45.6) 94 (42.9)
Non-Hispanic White 84 (32.2) 64 (29.2)
Non-Hispanic Black 54 (20.7) 56 (25.6)
Other 4 (1.5) 5 (2.3)
Age (at baseline) 16 (15, 17) 16 (15, 17) 0.310
% drug days 11 (0, 40) 7 (0, 27) 0.253
Externalizing Behavior5 0.078 (3.183) −0.128 (3.043) 0.470
Number of Arrests 1 (0, 2) 1 (0, 2) 0.431
Number of Juvenile Detentions 1 (0, 1) 1 (0, 1) 0.967
Family Functioning6 −0.196 (5.806) 0.071 (5.475) 0.604
1.

For categorical variables, N (%). For continuous variables, Means (SD) for approximately normal variables and Median (Q1, Q3) otherwise.

2.

For categorical variables, Fisher’s exact test p-values. For continuous variables, T-tests p-values for approximately normal variables and Wilcoxon two sample p-values otherwise.

3.

Except for % drug days (n=258), number of arrests (n=260), and number of juvenile detentions (n=207).

4.

Except for % drug days (n=218) and number of juvenile detentions (n=170).

5.

The reported value for externalizing is the mean of the square root of the raw score.

6.

The reported value for family functioning is the mean of the composite created for this outcome.