Table 1.
Basic characteristics of analytic samples for the construction of prediction models for 1 year and 1 to 6 years.
| Characteristics | Discovery | External validation (n=50,310) | |||||
|
|
Within 1 year (n=4683) | 1 to 6 years (n=17,493) |
|
||||
| Age (years), mean (SD) | 56.75 (8.03) | 56.65 (7.99) | 63.24 (7.49) | ||||
| Gender, n (%) | |||||||
|
|
Female | 2480 (53) | 9537 (54.5) | 25,675 (51) | |||
|
|
Male | 2203 (47) | 7956 (45.5) | 24,635 (49) | |||
| History of psychiatric disorders, n (%) | |||||||
|
|
No | 3760 (80.3) | 14,371 (82.2) | 39,226 (78) | |||
|
|
Yes | 923 (19.7) | 3122 (17.8) | 11,084 (22) | |||
| History of suicide attempt n (%) | |||||||
|
|
No | 4574 (97.7) | 17,270 (98.7) | 50,108 (99.6) | |||
|
|
Yes | 109 (2.3) | 223 (1.3) | 202 (0.4) | |||
| Have you ever seen a psychiatrist for nerves, anxiety, tension, or depression? n (%) | |||||||
|
|
No | 3999 (85.4) | 15,188 (86.8) | 45,372 (90.2) | |||
|
|
Yes | 660 (14.1) | 2248 (12.9) | 4556 (9.1) | |||
|
|
Missing | 24 (0.5) | 57 (0.3) | 382 (0.8) | |||
| Have you ever seen a general practitioner for nerves, anxiety, tension, or depression? n (%) | |||||||
|
|
No | 2882 (61.5) | 11,181 (63.9) | 34,168 (67.9) | |||
|
|
Yes | 1768 (37.8) | 6215 (35.5) | 15,685 (31.2) | |||
|
|
Missing | 33 (0.7) | 97 (0.6) | 457 (0.9) | |||
| In the past, how often have you smoked tobacco? n (%) | |||||||
|
|
Smoked on most or all days | 1212 (25.9) | 4237 (24.2) | 11,900 (23.7) | |||
|
|
Smoked occasionally | 573 (12.2) | 2231 (12.8) | 6061 (12) | |||
|
|
Just tried once or twice | 685 (14.6) | 2634 (15.1) | 7983 (15.9) | |||
|
|
I have never smoked | 1806 (38.6) | 6897 (39.4) | 22,789 (45.3) | |||
|
|
Missing | 407 (8.7) | 1494 (8.5) | 1577 (3.1) | |||
| Do you live in your own accommodation? n (%) | |||||||
|
|
No | 2194 (46.9) | 8136 (46.5) | 11,670 (23.2) | |||
|
|
Yes | 2414 (51.5) | 9155 (52.3) | 38,114 (75.8) | |||
|
|
Missing | 75 (1.6) | 202 (1.2) | 526 (1) | |||
| Average annual total household income before taxa, n (%) | |||||||
|
|
Less than £18,000 (US $16,676) | 945 (20.2) | 3410 (19.5) | 6502 (12.9) | |||
|
|
£18,000 to £30,999 (US $16,676 to $28,718) | 1045 (22.3) | 3802 (21.7) | 13,250 (26.3) | |||
|
|
£31,000 to £51,999 (US $28,719 to $48,173) | 1073 (22.9) | 3958 (22.6) | 13,577 (27) | |||
|
|
£52,000 to £100,000 (US $48,174 to $92,642) | 816 (17.4) | 3113 (17.8) | 9529 (18.9) | |||
|
|
Greater than £100,000 (US $92,642) | 194 (4.1) | 797 (4.6) | 2614 (5.2) | |||
|
|
Missing | 610 (13) | 2413 (13.8) | 4838 (9.6) | |||
| Cases, n (%) | 223 (47.62) | 833 (47.62) | 12 (0.02)b and 31 (0.06)c | ||||
aNote that income data were collected between 2008 and 2010. Income was converted to US dollars according to the current exchange range.
bRefers to the number of cases of suicidal behaviors within 1 year.
cRefers to the number of cases of suicidal behaviors for 1 to 6 years.