Background
Methods
Subjects
Measure
Principles of six different psychological autopsy information reconstruction methods
Statistical analyses
Results
Characteristics of informants of the target subjects
1st informant n (%) | 2nd informant n (%) | χ2/t | df |
P
| |
---|---|---|---|---|---|
Gender | 25.71 | 1 | < 0.001 | ||
Male | 159 (38.2) | 232 (55.8) | |||
Female | 257 (61.8) | 184 (44.2) | |||
Age (yr) | 36 (29, 46) a | 31 (21, 41) a | 6.36b | 827 | < 0.001 |
Marital status | 51.43 | 3 | < 0.001c | ||
Single | 35 (8.4) | 112 (26.9) | |||
Married | 371 (89.2) | 298 (71.7) | |||
Widowed | 9 (2.2) | 5 (1.2) | |||
Others | 1 (0.2) | 1 (0.2) | |||
Education (yr) | 9 (6, 9) a | 9 (7, 9) a | − 3.65b | 830 | < 0.001 |
Religion | 4.36 | 4 | 0.317c | ||
Atheism | 378 (90.9) | 386 (92.8) | |||
Catholicism | 10 (2.4) | 8 (1.9) | |||
Buddhism | 26 (6.2) | 20 (4.8) | |||
Other religion | 0 (0) | 2 (0.5) | |||
Data missing | 2 (0.5) | 0 (0) | |||
Annual family income (1000 RMB) | 14.3 (10.0, 25.0) a | 15.0 (10.0, 25.0) a | − 0.68b | 728 | 0.498 |
CES-D score | 4 (1, 9) a | 4 (1, 9) a | 0.29b | 826 | 0.771 |
Familiarity to the target | 78.45 | 5 | < 0.001c | ||
Very unfamiliar | 0(0) | 1(0.2) | |||
Unfamiliar | 7(1.7) | 9(2.2) | |||
Middle | 67(16.1) | 154(37.0) | |||
Familiar | 159(38.2) | 155(37.3) | |||
Very familiar | 139(33.4) | 51(12.2) | |||
Data missing | 44(10.6) | 46(11.1) |
groups | variables | Suicides (n = 392) | Controls (n = 416) | t | df |
P
|
---|---|---|---|---|---|---|
1st informant | Gender | 28.92d | 1 | < 0.001 | ||
Male | 224 (57.1) a | 159 (38.2) a | ||||
Female | 168 (42.9) a | 257 (61.8) a | ||||
Age (yr) | 49 (38, 57) b | 36 (29, 46) b | 10.77 | 800 | < 0.001 | |
Education (yr) | 6 (4, 9) a | 9 (6, 9) a | − 6.42b | 806 | < 0.001 | |
Familiarity to the target | 2.90(0.99) c | 3.16(0.78) c | − 3.93 | 731 | < 0.001 | |
2nd informant | Gender | 0.01 | 1 | 0.906 | ||
Male | 217 (55.4) | 232 (55.8) | ||||
Female | 175 (44.6) | 184 (44.2) | ||||
Age (yr) | 43 (33, 52) b | 31 (21, 41) b | 6.36 | 806 | < 0.001 | |
Education (yr) | 9 (6, 9) a | 9 (7, 9) a | −3.65 | 801 | < 0.001 | |
Familiarity to the target | 2.34(0.82) c | 2.66(0.75) c | − 5.54 | 728 | < 0.001 |
Life events | Typea | Target |
P
| Life event | Typea | Target |
P
| ||||||||
Posb | Negc | Total | Pos | Neg | Total | ||||||||||
Cat1 | PD | 1st | Pos | 48 | 20 | 68 | 0.018 | Cat2 | PD | 1 st | Pos | 74 | 41 | 115 | 0.828 |
Neg | 39 | 309 | 348 | Neg | 44 | 257 | 301 | ||||||||
Total | 87 | 329 | 416 | Total | 118 | 298 | 416 | ||||||||
2nd | Pos | 40 | 20 | 60 | 0.001 | 2 nd | Pos | 64 | 22 | 86 | 0.000 | ||||
Neg | 47 | 309 | 356 | Neg | 54 | 276 | 330 | ||||||||
Total | 87 | 329 | 416 | Total | 118 | 298 | 416 | ||||||||
C | Pos | 54 | 36 | 90 | 0.810 | C | Pos | 86 | 59 | 145 | 0.006 | ||||
Neg | 33 | 293 | 326 | Neg | 32 | 239 | 271 | ||||||||
Total | 87 | 329 | 416 | Total | 118 | 298 | 416 | ||||||||
D | Pos | 34 | 2 | 36 | 0.000 | D | Pos | 47 | 2 | 49 | 0.000 | ||||
Neg | 53 | 327 | 380 | Neg | 71 | 296 | 367 | ||||||||
Total | 87 | 329 | 416 | Total | 118 | 298 | 416 | ||||||||
Cat3 | PD | 1 st | Pos | 26 | 27 | 53 | 0.000 | Cat4 | PD | 1 st | Pos | 55 | 36 | 91 | 0.030 |
Neg | 73 | 290 | 363 | Neg | 58 | 267 | 325 | ||||||||
Total | 99 | 317 | 416 | Total | 113 | 303 | 416 | ||||||||
2 nd | Pos | 30 | 20 | 50 | 0.000 | 2 nd | Pos | 50 | 19 | 69 | 0.000 | ||||
Neg | 69 | 297 | 366 | Neg | 63 | 284 | 347 | ||||||||
Total | 99 | 317 | 416 | Total | 113 | 303 | 416 | ||||||||
C | Pos | 45 | 44 | 89 | 0.363 | C | Pos | 70 | 50 | 120 | 0.534 | ||||
Neg | 54 | 273 | 327 | Neg | 43 | 253 | 296 | ||||||||
Total | 99 | 317 | 416 | Total | 113 | 303 | 416 | ||||||||
D | Pos | 11 | 2 | 13 | 0.000 | D | Pos | 31 | 4 | 35 | 0.000 | ||||
Neg | 88 | 315 | 403 | Neg | 82 | 299 | 381 | ||||||||
Total | 99 | 317 | 416 | Total | 113 | 303 | 416 | ||||||||
Cat5 | PD | 1 st | Pos | 7 | 12 | 19 | 0.000 | ||||||||
Neg | 43 | 354 | 397 | ||||||||||||
Total | 50 | 366 | 416 | ||||||||||||
2 nd | Pos | 8 | 21 | 29 | 0.011 | ||||||||||
Neg | 42 | 345 | 387 | ||||||||||||
Total | 50 | 366 | 416 | ||||||||||||
C | Pos | 11 | 32 | 43 | 0.477 | ||||||||||
Neg | 39 | 334 | 373 | ||||||||||||
Total | 50 | 366 | 416 | ||||||||||||
D | Pos | 4 | 0 | 4 | 0.000 | ||||||||||
Neg | 46 | 366 | 412 | ||||||||||||
Total | 50 | 366 | 416 |
Type | Life event | Positive rate (%) | Sensitivity (%) | Specificity (%) | Youden index (%) | Kappa value | |
---|---|---|---|---|---|---|---|
Proxy data | Target | ||||||
1st | Cat1 | 16.35 | 20.91 | 55.17 | 93.92 | 49.09 | 0.53** |
Cat2 | 27.64 | 28.37 | 62.71 | 86.24 | 48.95 | 0.49** | |
Cat3 | 12.74 | 23.80 | 26.26 | 91.48 | 17.74 | 0.21** | |
Cat4 | 21.88 | 27.16 | 48.67 | 88.12 | 36.79 | 0.39** | |
Cat5 | 4.57 | 12.02 | 14.00 | 96.72 | 10.72 | 0.15* | |
2nd | Cat1 | 14.42 | 20.91 | 45.98 | 93.92 | 39.90 | 0.45** |
Cat2 | 20.67 | 28.37 | 54.24 | 92.62 | 46.86 | 0.51** | |
Cat3 | 12.02 | 23.80 | 30.30 | 93.69 | 23.99 | 0.29** | |
Cat4 | 16.59 | 27.16 | 44.25 | 93.73 | 37.98 | 0.43** | |
Cat5 | 6.97 | 12.02 | 16.00 | 94.26 | 10.26 | 0.13* | |
C | Cat1 | 21.63 | 20.91 | 62.07 | 89.06 | 51.13 | 0.51** |
Cat2 | 34.86 | 28.37 | 72.88 | 80.20 | 53.08 | 0.50** | |
Cat3 | 21.39 | 23.80 | 45.45 | 86.12 | 31.57 | 0.33** | |
Cat4 | 28.85 | 27.16 | 61.95 | 83.50 | 45.45 | 0.45** | |
Cat5 | 10.34 | 12.02 | 22.00 | 91.26 | 13.26 | 0.14* | |
D | Cat1 | 8.65 | 20.91 | 39.08 | 99.39 | 38.47 | 0.49** |
Cat2 | 11.78 | 28.37 | 39.83 | 99.33 | 39.16 | 0.48** | |
Cat3 | 3.13 | 23.80 | 11.11 | 99.37 | 10.48 | 0.15** | |
Cat4 | 8.41 | 27.16 | 27.43 | 98.68 | 26.11 | 0.33** | |
Cat5 | 0.96 | 12.02 | 8.00 | 100.00 | 8.00 | 0.13** |
Variable | Source | S.S. | df | M.S. |
F
|
P
|
---|---|---|---|---|---|---|
Sensitivity | Treat | 0.198 | 5 | 0.040 | 25.176 | < 0.001 |
Block | 0.734 | 4 | 0.183 | 116.394 | < 0.001 | |
Error | 0.032 | 20 | 0.002 | – | – | |
Total | 0.964 | 29 | – | – | – | |
Specificity | Treat | 0.047 | 5 | 0.009 | 21.171 | < 0.001 |
Block | 0.014 | 4 | 0.003 | 7.614 | 0.007 | |
Error | 0.009 | 20 | 0.004 | – | – | |
Total | 0.070 | 29 | – | – | – | |
Youden index | Treat | 0.053 | 5 | 0.011 | 10.082 | 0.001 |
Block | 0.600 | 4 | 0.150 | 143.149 | < 0.001 | |
Error | 0.021 | 20 | 0.001 | – | – | |
Total | 0.674 | 29 | – | – | – | |
Kappa value | Treat | 0.013 | 5 | 0.003 | 1.895 | 0.139 |
Block | 0.601 | 4 | 0.150 | 110.861 | < 0.001 | |
Error | 0.027 | 20 | 0.001 | – | – | |
Total | 0.641 | 29 | – | – | – |