Table 1.
General characteristics of the study subjects
| Variables | Total | Suicidal ideation |
Suicidal planning |
Suicide attempt |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Yes | No | Yes | No | Yes | No | |||||
| Total | 118 715 (100.0) | 14 708 (12.4) | 104 007 (87.6) | 4675 (3.9) | 114 040 (96.1) | 3142 (2.6) | 115 573 (97.4) | |||
| Parental marital status | <0.001 | <0.001 | <0.001 | |||||||
| Two biological parents | 108 306 (91.2) | 13 024 (12.0) | 95 282 (88.0) | 4095 (3.8) | 104 211 (96.2) | 2783 (2.6) | 106 311 (98.2) | |||
| Single biological parent | 5631 (4.7) | 860 (15.3) | 4771 (84.7) | 277 (4.9) | 5354 (95.1) | 204 (3.6) | 5427 (96.4) | |||
| One biological parent and a new spouse | 2091 (1.8) | 430 (20.6) | 1661 (79.4) | 147 (7.0) | 1944 (93.0) | 127 (6.1) | 1964 (93.9) | |||
| Two adoptive parents or a single adoptive parent | 1778 (1.5) | 219 (12.3) | 1559 (87.7) | 82 (4.6) | 1696 (95.4) | 49 (2.8) | 1729 (97.2) | |||
| None | 909 (0.8) | 175 (19.3) | 734 (80.7) | 74 (8.1) | 835 (91.9) | 66 (7.3) | 843 (92.7) | |||
| Live with family | <0.001 | <0.001 | <0.001 | |||||||
| Yes | 112 745 (95.0) | 13 834 (12.3) | 98 911 (87.7) | 4366 (3.9) | 108 379 (96.1) | 2944 (2.6) | 109 801 (97.4) | |||
| No | 5970 (5.0) | 874 (14.6) | 5096 (85.4) | 309 (5.2) | 5661 (94.8) | 198 (3.3) | 5772 (96.7) | |||
| Siblings | <0.001 | <0.001 | <0.001 | |||||||
| Yes | 102 799 (86.6) | 12 535 (12.2) | 90 264 (87.8) | 3929 (3.8) | 98 870 (96.2) | 2626 (2.6) | 100 173 (97.4) | |||
| No | 15 916 (13.4) | 2173 (13.7) | 13 743 (86.3) | 746 (4.7) | 15 170 (95.3) | 516 (3.2) | 15 400 (96.8) | |||
| Grandparents | 0.474 | 0.312 | 0.187 | |||||||
| Yes | 63 301 (53.3) | 7802 (12.3) | 55 499 (87.7) | 2459 (3.9) | 60 842 (96.1) | 1639 (2.6) | 61 662 (97.4) | |||
| No | 55 414 (46.7) | 6906 (12.5) | 48 508 (87.5) | 2216 (4.0) | 53 198 (96.0) | 1503 (2.7) | 53 911 (97.3) | |||
| Multicultural parents | 0.023 | 0.035 | <0.001 | |||||||
| Yes | 1751 (1.5) | 248 (14.2) | 1503 (85.8) | 86 (4.9) | 1665 (95.1) | 71 (4.1) | 1680 (95.9) | |||
| No | 116 964 (98.5) | 14 460 (12.4) | 102 504 (87.6) | 4589 (3.9) | 112 375 (96.1) | 3071 (2.6) | 113 893 (97.4) | |||
| Age (y) | <0.001 | <0.001 | <0.001 | |||||||
| ≤12.9 | 9597 (8.1) | 1031 (10.7) | 8566 (89.3) | 375 (3.9) | 9222 (96.1) | 278 (2.9) | 9319 (97.1) | |||
| 13.0-14.9 | 39 774 (33.5) | 5246 (13.2) | 34 528 (86.8) | 1820 (4.6) | 37 954 (95.4) | 1229 (3.1) | 38 545 (96.9) | |||
| 15.0-16.9 | 39 575 (33.3) | 4811 (12.2) | 34 764 (87.8) | 1445 (3.7) | 38 130 (96.3) | 954 (2.4) | 38 621 (97.6) | |||
| ≥17.0 | 29 769 (25.1) | 3620 (12.2) | 26 149 (87.8) | 1035 (3.5) | 28 734 (96.5) | 681 (2.3) | 29 088 (97.7) | |||
| Sex | <0.001 | <0.001 | <0.001 | |||||||
| Male | 60 269 (50.8) | 5420 (9.0) | 54 849 (91.0) | 1889 (3.1) | 58 380 (96.9) | 1084 (1.8) | 59 185 (98.2) | |||
| Female | 58 446 (49.2) | 9288 (15.9) | 49 158 (84.1) | 2786 (4.8) | 55 660 (95.2) | 2058 (3.5) | 56 388 (96.5) | |||
| Region | 0.035 | 0.277 | 0.978 | |||||||
| Metropolitan | 61 162 (51.5) | 7697 (12.6) | 53 465 (87.4) | 2445 (4.0) | 58 717 (96.0) | 1618 (2.6) | 59 544 (97.4) | |||
| Rural | 57 553 (48.5) | 7011 (12.2) | 50 542 (87.8) | 2230 (3.9) | 55 323 (96.1) | 1524 (2.6) | 56 029 (97.4) | |||
| Educational level | <0.001 | <.001 | <0.001 | |||||||
| Middle school | 59 523 (50.1) | 7655 (12.9) | 51 868 (87.1) | 2681 (4.5) | 56 842 (95.5) | 1832 (3.1) | 57 691 (96.9) | |||
| High school | 59 192 (49.9) | 7053 (11.9) | 52 139 (88.1) | 1994 (3.4) | 57 198 (96.6) | 1310 (2.2) | 57 882 (97.8) | |||
| Household income | <0.001 | <0.001 | <0.001 | |||||||
| High | 47 660 (40.1) | 5201 (10.9) | 42 459 (89.1) | 1757 (3.7) | 45 903 (96.3) | 1109 (2.3) | 46 551 (97.7) | |||
| Middle | 55 056 (46.4) | 6338 (11.5) | 48 718 (88.5) | 1856 (3.4) | 53 200 (96.6) | 1290 (2.3) | 53 766 (97.7) | |||
| Low | 15 999 (13.5) | 3169 (19.8) | 12 830 (80.2) | 1062 (6.6) | 14 937 (93.4) | 743 (4.6) | 15 256 (95.4) | |||
| Academic achievement | <0.001 | <0.001 | <0.001 | |||||||
| High | 46 653 (39.3) | 5003 (10.7) | 41 650 (89.3) | 1573 (3.4) | 45 080 (96.6) | 973 (2.1) | 45 680 (97.9) | |||
| Middle | 34 582 (29.1) | 3900 (11.3) | 30 682 (88.7) | 1214 (3.5) | 33 368 (96.5) | 766 (2.2) | 33 816 (97.8) | |||
| Low | 37 480 (31.6) | 5805 (15.5) | 31 675 (84.5) | 1888 (5.0) | 35 592 (95.0) | 1403 (3.7) | 36 077 (96.3) | |||
| Frequency of eating breakfast (times/wk) | <0.001 | <0.001 | <0.001 | |||||||
| 0-2 | 38 437 (32.4) | 5438 (14.1) | 32 999 (85.9) | 1791 (4.7) | 36 646 (95.3) | 1299 (3.4) | 37 138 (96.6) | |||
| 3-5 | 29 188 (24.6) | 3925 (13.4) | 25 263 (86.6) | 1246 (4.3) | 27 942 (95.7) | 819 (2.8) | 28 369 (97.2) | |||
| 6-7 | 51 090 (43.0) | 5345 (10.5) | 45 745 (89.5) | 1638 (3.2) | 49 452 (96.8) | 1024 (2.0) | 50 066 (98.0) | |||
| Drinking status (times/wk) | <0.001 | <0.001 | <0.001 | |||||||
| Never | 71 371 (60.1) | 7198 (10.1) | 64 173 (89.9) | 2159 (3.0) | 69 212 (97.0) | 1322 (1.9) | 70 049 (98.1) | |||
| <1 | 39 824 (33.5) | 5990 (15.0) | 33 834 (85.0) | 1906 (4.8) | 37 918 (95.2) | 1313 (3.3) | 38 511 (96.7) | |||
| 2-3 | 6826 (5.7) | 1353 (19.8) | 5473 (80.2) | 528 (7.7) | 6298 (92.3) | 438 (6.4) | 6388 (93.6) | |||
| ≥4 | 694 (0.6) | 167 (24.1) | 527 (75.9) | 82 (11.8) | 612 (88.2) | 69 (9.9) | 625 (90.1) | |||
| Lifetime smoking | <0.001 | <0.001 | <0.001 | |||||||
| No | 102 937 (86.7) | 11 917 (11.6) | 91 020 (88.4) | 3621 (3.5) | 99 316 (96.5) | 2318 (2.3) | 100 619 (97.7) | |||
| Yes | 15 778 (13.3) | 2791 (17.7) | 12 987 (82.3) | 1054 (6.7) | 14 724 (93.3) | 824 (5.2) | 14 954 (94.8) | |||
| Body mass index1 | 0.253 | 0.823 | 0.752 | |||||||
| Normal or underweight (<25 kg/m2) | 101 784 (85.7) | 12 565 (12.3) | 89 219 (87.7) | 4003 (3.9) | 97 781 (96.1) | 2700 (2.7) | 99 084 (97.3) | |||
| Obese (≥25 kg/m2) | 16 931 (14.3) | 2143 (12.7) | 14 788 (87.3) | 672 (4.0) | 16 259 (96.0) | 442 (2.6) | 16 489 (97.4) | |||
| Stress | <0.001 | <0.001 | <0.001 | |||||||
| A little | 72 891 (61.4) | 3168 (4.3) | 69 723 (95.7) | 1090 (1.5) | 71 801 (98.5) | 711 (1.0) | 72 180 (99.0) | |||
| A lot | 45 824 (38.6) | 11 540 (25.2) | 34 284 (74.8) | 3585 (7.8) | 42 239 (92.2) | 2431 (5.3) | 43 393 (94.7) | |||
| Physical activity | <0.001 | 0.017 | 0.581 | |||||||
| No | 38 979 (32.8) | 4451 (11.4) | 34 528 (88.6) | 1610 (4.1) | 37 369 (95.9) | 1046 (2.7) | 37 933 (97.3) | |||
| Yes | 79 736 (67.2) | 10 257 (12.9) | 69 479 (87.1) | 3065 (3.8) | 76 671 (96.2) | 2096 (2.6) | 77 640 (97.4) | |||
Values are presented as number (%).
1
Obesity status was defined by body mass index based on the 2014 Clinical Practice Guidelines for Overweight and Obesity in Korea.