Table 2.
Differences in baseline characteristics between participants that returned and those that dropped out at the 4-month follow-up.
| Variable (number of missing values) | Total (N=1247) | Returned (n=612) | Dropped out (n=635) | Test statistic | P value | ||||||
| Age (15-19-year-olds) (0), mean (SD) | 16.32 (1.07) | 16.11 (0.99) | 16.53 (1.10) | Ua=236280.5; t1237.926=–7.090 | <.001; <.001 |
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| Gender (0), n (%) |
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χ21=0.5 | .49 | ||||||
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Male | 586 (46.99) | 282 (46.1) | 304 (47.9) |
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Female | 661 (53.01) | 330 (53.9) | 331 (52.1) |
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| Educational level (0), n (%) |
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|
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χ22=58.8 | <.001 | ||||||
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Compulsory secondary education | 545 (43.70) | 313 (51.1) | 232 (36.5) |
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Baccalaureate program | 515 (41.30) | 252 (41.2) | 263 (41.4) |
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Vocational training | 187 (15.00) | 47 (7.7) | 140 (22.1) |
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| Religion (3), n (%) |
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|
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χ24=2.9 | .57 | ||||||
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Catholic | 767 (61.65) | 385 (62.9) | 382 (60.4) |
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Protestant or Evangelical | 26 (2.09) | 11 (1.8) | 15 (2.4) |
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Muslim or Islamic | 18 (1.45) | 9 (1.5) | 9 (1.4) |
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Other | 28 (2.25) | 10 (1.6) | 18 (2.8) |
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No religion | 405 (32.56) | 196 (32.1) | 209 (32.9) |
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| Ethnicity (3), n (%) |
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χ21=1.2 | .26 | ||||||
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Spanish | 1178 (94.69) | 583 (95.4) | 595 (94.0) |
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Non-Spanish | 66 (5.31) | 28 (4.6) | 38 (6.0) |
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| Apgar test (55), n (%) |
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χ21=1.2 | .28 | ||||||
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Functional family | 886 (74.33) | 446 (75.7) | 440 (73.0) |
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Dysfunctional family | 306 (25.67) | 143 (24.3) | 163 (27.0) |
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| Family affluence (49), n (%) |
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χ22=0.9 | .63 | ||||||
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Low | 33 (2.76) | 16 (2.7) | 17 (2.8) |
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Medium | 387 (32.30) | 183 (31.0) | 204 (33.5) |
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High | 778 (64.94) | 391 (66.3) | 387 (63.7) |
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| Alcohol use (0) |
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Binge drinking, n (%) | 487 (39.05) | 219 (35.8) | 268 (42.2) | χ21=5.6 | .02 | |||||
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Heavy episodic drinking, n (%) | 16 (1.28) | 8 (1.3) | 8 (1.3) | χ21=0.005 | .95 | |||||
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Weekly consumption, mean (SD) | 1.45 (4.30) | 1.22 (3.33) | 1.68 (5.06) | U=206367; t1098.665=–1.929 | .01; .054 | |||||
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Any consumption, n (%) | 832 (66.72) | 404 (66.0) | 428 (67.4) | χ21=0.4 | .55 | |||||
aMann-Whitney U test.