Table 1. Demographic characteristics of the subjects (N = 528) by SDQ scores.
| Variables | Groups by SDQ scores | χ2 | P value | ||
|---|---|---|---|---|---|
| Nonsymptomatic group (n = 411) | Symptomatic group (n = 117) | ||||
| Gender | 0.185 | 0.667 | |||
| Boy | 213 (51.8) | 58 (49.6) | |||
| Girl | 198 (48.2) | 59 (50.4) | |||
| Type of school | 3.314 | 0.191 | |||
| Elementary school | 19 (4.6) | 3 (2.6) | |||
| Middle school | 128 (31.2) | 46 (39.3) | |||
| High school | 264 (64.2) | 68 (58.1) | |||
| Family type | 6.428 | 0.040* | |||
| Parents | 310 (77.7) | 77 (70.0) | |||
| Single parent | 72 (18.0) | 31 (28.2) | |||
| Others | 17 (4.3) | 2 (1.8) | |||
| SES | 8.981 | 0.011* | |||
| High | 36 (10.9) | 7 (7.2) | |||
| Middle | 229 (69.4) | 57 (58.8) | |||
| Low | 65 (19.7) | 33 (34.0) | |||
| Emotional behavior problems | 112.543 | < 0.001*** | |||
| Yes | 111 (30.6) | 96 (88.1) | |||
| No | 252 (69.4) | 13 (11.9) | |||
| Physical illness | 9.320 | 0.002** | |||
| Yes | 62 (16.1) | 30 (29.4) | |||
| No | 323 (83.9) | 72 (70.6) | |||
| Mental illness | 100.045 | < 0.001*** | |||
| Yes | 52 (14.6) | 64 (64.0) | |||
| No | 303 (85.4) | 36 (36.0) | |||
| Trigger events | 3.967 | 0.046* | |||
| Yes | 148 (45.0) | 48 (57.1) | |||
| No | 181 (55.0) | 36 (42.9) | |||
| Self-harm experience | 43.294 | < 0.001*** | |||
| Yes | 34 (10.0) | 38 (37.6) | |||
| No | 305 (90.0) | 63 (62.4) | |||
| Suicide attempt | 26.890 | < 0.001*** | |||
| Yes | 19 (5.9) | 23 (24.2) | |||
| No | 301 (94.1) | 72 (75.8) | |||
| Record of attendance | 78.612 | < 0.001*** | |||
| Good | 331 (81.5) | 45 (39.5) | |||
| Poor | 75 (18.5) | 69 (60.5) | |||
| Conduct problems | 25.641 | < 0.001*** | |||
| Yes | 41 (10.3) | 33 (29.2) | |||
| No | 359 (89.9) | 80 (70.8) | |||
| Depressive symptoms | 71.896 | < 0.001*** | |||
| Yes | 75 (20.7) | 69 (63.3) | |||
| No | 288 (79.3) | 40 (36.7) | |||
| Anxiety | 64.935 | < 0.001*** | |||
| Yes | 27 (7.4) | 67 (61.5) | |||
| No | 336 (92.6) | 42 (38.5) | |||
| Impulsiveness | 78.347 | < 0.001*** | |||
| Yes | 18 (5.0) | 40 (36.7) | |||
| No | 345 (95.0) | 69 (63.3) | |||
| Social problems | 52.692 | < 0.001*** | |||
| Yes | 18 (5.0) | 32 (29.4) | |||
| No | 345 (95.0) | 77 (70.6) | |||
The total number of each variable varies due to missing values; however, the total numbers of members of each group are as follows: nonsymptomatic group = 411, symptomatic group = 117.
SDQ = The Korean version of the Strengths and Difficulties Questionnaire, SES = Socio-economic status.
*P < 0.05, **P < 0.01, ***P < 0.001.