Table 3.
Baseline characteristics of participants by condition.
| Variable (number of missing values) | Total (N=1247) | Experimental group (n=742) | Control group (n=505) | Test statistic | P value | ||||||
| Schools, n | 15 | 8 | 7 | N/Aa | N/A | ||||||
| Classrooms per school, n | 62 | 38 | 24 | N/A | N/A | ||||||
| Students per classroom, mean (SD), range | N/A | 19.53 (6.90), 25 | 21.04 (5.87), 26 | N/A | N/A | ||||||
| Age (15-19-year-olds) (0), mean (SD) | 16.32 (1.07) | 16.40 (1.06) | 16.21 (1.06) |
Ub=208553; t1245=–3.150 |
<.001; .002 |
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| Gender (0), n (%) |
|
|
|
χ21=0.2 | .67 | ||||||
|
|
Male | 586 (46.99) | 345 (46.5) | 241 (47.7) |
|
|
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|
|
Female | 661 (53.01) | 397 (53.5) | 264 (52.3) |
|
|
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| Educational level (0), n (%) |
|
|
|
χ22=12.1 | .002 | ||||||
|
|
Compulsory secondary education | 545 (43.70) | 321 (43.3) | 224 (44.4) |
|
|
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|
|
Baccalaureate program | 515 (41.30) | 289 (38.9) | 226 (44.8) |
|
|
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|
|
Vocational training | 187 (15.00) | 132 (17.8) | 55 (10.9) |
|
|
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| Religion (3), n (%) |
|
|
|
χ24=3.1 | .55 | ||||||
|
|
Catholic | 767 (61.65) | 462 (62.3) | 305 (60.6) |
|
|
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|
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Protestant or Evangelical | 26 (2.09) | 19 (2.6) | 7 (1.4) |
|
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|
|
Muslim or Islamic | 18 (1.45) | 10 (1.4) | 8 (1.6) |
|
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|
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Other | 28 (2.25) | 15 (2.0) | 13 (2.6) |
|
|
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|
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No religion | 405 (32.56) | 235 (31.7) | 170 (33.8) |
|
|
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| Ethnicity (3), n (%) |
|
|
|
χ21=1.9 | .17 | ||||||
|
|
Spanish | 1178 (94.69) | 707 (95.4) | 471 (93.6) |
|
|
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|
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Non-Spanish | 66 (5.31) | 34 (4.6) | 32 (6.4) |
|
|
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| Apgar test (55), n (%) |
|
|
|
χ21=2.2 | .14 | ||||||
|
|
Functional family | 886 (74.33) | 516 (72.8) | 370 (76.6) |
|
|
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|
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Dysfunctional family | 306 (25.67) | 193 (27.2) | 113 (23.4) |
|
|
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| Family affluence (49) |
|
|
|
χ22=3.5 | .17 | ||||||
|
|
Low | 33 (2.76) | 17 (2.4) | 16 (3.3) |
|
|
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|
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Medium | 387 (32.30) | 244 (34.2) | 143 (29.5) |
|
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|
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High | 778 (64.94) | 452 (63.4) | 326 (67.2) |
|
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| Alcohol use (0) |
|
|
|
|
|
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|
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Binge drinking, n (%) | 487 (39.10) | 298 (40.2) | 189 (37.4) | χ21=0.9 | .33 | |||||
|
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Heavy episodic drinking, n (%) | 16 (1.30) | 8 (1.1) | 8 (1.6) | χ21=0.6 | .44 | |||||
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|
Weekly consumption, mean (SD) | 1.45 (4.30) | 1.47 (3.78) | 1.42 (4.96) |
U=190393.5 t1245=-0.2 |
.52 .84 |
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|
|
Any consumption, n (%) | 832 (66.70) | 486 (65.5) | 346 (68.5) | χ21=1.2 | .27 | |||||
aNot applicable.
bMann-Whitney U test.