Table 1.
Baseline and follow-up results for scholastic variables (F—frequency, %—percentage) with differences on a basis of consumption of illicit drugs (MW—Mann Whitney Z values, p—level of significance).
| Predictors | Baseline | Follow-Up | ||||
|---|---|---|---|---|---|---|
| Nonusers | Users | MW | Nonusers | Users | MW | |
| F (%) | F (%) | Z (p) | F (%) | F (%) | Z (p) | |
| Grade point average | ||||||
| Excellent | 160 (38.37) | 5 (26.32) | −0.60 (0.54) | 156 (38.33) | 8 (27.59) | −2.03 (0.04) |
| Very good | 156 (37.41) | 10 (52.63) | 162 (39.8) | 9 (31.03) | ||
| Average | 83 (19.9) | 3 (15.79) | 81 (19.9) | 10 (34.48) | ||
| Under average | 6 (1.44) | 0 (0) | 5 (1.23) | 0 (0) | ||
| Poor | 12 (2.88) | 1 (5.26) | 3 (0.74) | 2 (6.9) | ||
| Missing | 0 (0) | 0 (0) | 0 (0) | 0 (0) | ||
| Absences from school | ||||||
| Less than 10 h | 188 (45.08) | 2 (10.53) | −4.29 (0.01) | 147 (36.12) | 1 (3.45) | −5.21 (0.01) |
| 10–20 h | 163 (39.09) | 6 (31.58) | 165 (40.54) | 8 (27.59) | ||
| 21–40 h | 54 (12.95) | 7 (36.84) | 77 (18.92) | 16 (55.17) | ||
| More than 40 h | 12 (2.88) | 4 (21.05) | 18 (4.42) | 4 (13.79) | ||
| Missing | 0 (0) | 0 (0) | 0 (0) | 0 (0) | ||
| Unexcused absences | ||||||
| None | 300 (71.94) | 12 (63.16) | −1.00 (0.31) | 276 (67.81) | 9 (31.03) | −4.51 (0.01) |
| 1–5 h | 75 (17.99) | 3 (15.79) | 78 (19.16) | 8 (27.59) | ||
| 6–10 h | 19 (4.56) | 2 (10.53) | 30 (7.37) | 5 (17.24) | ||
| More than 10 h | 23 (5.52) | 2 (10.52) | 23 (5.56) | 6 (20.68) | ||
| Missing | 0 (0) | 0 (0) | 0 (0) | 1 (3.45) | ||
| Behavioral grade | ||||||
| Excellent | 359 (86.09) | 13 (68.42) | −2.02 (0.04) | 344 (84.52) | 15 (51.72) | −4.72 (0.01) |
| Very good | 38 (9.11) | 5 (26.32) | 32 (7.86) | 4 (13.79) | ||
| Average | 11 (2.64) | 1 (5.26) | 22 (5.41) | 7 (24.14) | ||
| Under average | 9 (2.16) | 0 (0) | 6 (1.47) | 1 (3.45) | ||
| Poor | 0 (0) | 0 (0) | 3 (0.74) | 2 (6.9) | ||
| Missing | 0 (0) | 0 (0) | 0 (0) | 0 (0) | ||