Table 1.
Comparison of sociodemographic variables between both study groups.
| Variable | Cases (N = 40) |
Control (N = 80) |
Chi-Squared/Z Value/t-Test (d.f.) | p-Value |
|---|---|---|---|---|
| Female gender, n (%) | 32 (80.0) | 60 (75.0) | 0.373 (1) | 0.650 |
| Age, median (range) | 15 (12–17) | 15 (12–17) | −0.006 | 0.995 |
| Schooling α, n (%) | ||||
| Middle-school grade 6 | 3 (7.5) | 4 (5.0) | 38.555 (9) | |
| Middle-school grade 7 | 4 (10.0) | 18 (22.5) | ||
| Middle-school grade 8 | 13 (32.5) | 22 (27.5) | <0.001 | |
| High-school grade 9 | 7 (17.5) | 0 (0.0) | ||
| High-school grade 10 | 8 (20.0) | 25 (31.25) | ||
| High-school grade 11 | 5 (12.5) | 11 (13.75) | ||
| Number of siblings, median (range) | 2 (0–7) | 2 (0–5) | −0.637 | 0.531 |
| Grade-point average, mean ± SD | 8.40 ± 1.01 | 8.77 ± 0.81 | −2.031 (65) | 0.046 |
| Maximum Paternal schooling, n (%) | ||||
| Elementary School | 0 (0.0) | 3 (3.75) | 4.492 (3) | |
| Middle school | 10 (25.0) | 31 (38.75) | ||
| High school | 18 (45.0) | 26 (32.5) | 0.236 | |
| College | 12 (30.0) | 19 (23.75) | ||
| Unknown | 0 (0.0) | 1 (1.25) | ||
| Parental marital status, n (%) | 7.617 (6) | 0.224 | ||
| Married | 17 (42.5) | 50 (62.5) | ||
| Divorced | 4 (10.0) | 7 (8.8) | ||
| Single mother | 3 (7.5) | 4 (5.0) | ||
| Single father | 0 (0.0) | 1 (1.2) | ||
| Separated | 7 (17.5) | 11 (13.8) | ||
| Free union | 6 (15.0) | 6 (7.5) | ||
| Widow | 3 (7.5) | 1 (1.2) | ||
| Housing conditions, n (%) | 5.048 (2) | 0.089 | ||
| Own | 25 (62.5) | 59 (73.7) | ||
| Rented | 8 (20.0) | 17 (21.3) | ||
| Borrowed | 7 (17.5) | 4 (5.0) | ||
| Suicidal attempts, median (range) | 2 (1–18) | – | – | – |
| Psychiatric disorders β, n (%) | ||||
| Disorder due to use of volatile inhalants (F18.1) | 1 (2.5) | – | – | |
| Single-episode depressive-disorder, severe, without psychotic symptoms (F32.2) | 9 (22.5) | – | ||
| Recurrent depressive-disorder, current episode severe, without psychotic symptoms (F33.2) | 22 (55.0) | – | ||
| Recurrent depressive-disorder, current episode severe, with psychotic symptoms (F33.3) | 2 (5.0) | – | – | |
| Dysthymic disorder (F34.1) | 2 (5.0) | – | ||
| Mixed depressive- and anxiety-disorder (F41.2) | 1 (2.5) | – | ||
| Borderline pattern (F60.3) | 2 (5.0) | – | ||
| Attention-deficit-hyperactivity disorder (F90) | 1 (2.5) | – |
α High school in Mexico includes grade 9 to 11, β ICD-10 diagnoses, p values obtained with chi-squared, Mann–Whitney U test and Student’s t-test. d.f.: degrees of freedom; Z values (obtained with Mann–Whitney U test), do not have d.f.