Table 1.
Sociodemographic and clinical characteristics of the study group
| Total sample | Recent SA (≤7 days) | Lifetime SA (≥8 days) | No history of SA | χ 2/ANOVA a/Student’s t-test b/Kruskal–Wallis test b | p | |
|---|---|---|---|---|---|---|
| n = 538 | n = 126 | n = 276 | n = 136 | |||
| Sociodemographic data | ||||||
| Sex (n [%)] | ||||||
| Males | 168 (31.2%) | 36 (28.6%) | 77 (27.9%) | 55 (40.4%) | 7.214 | 0.027 |
| Females | 370 (68.8%) | 90 (71.4%) | 199 (72.1%) | 81 (59.6%) | ||
| Age (mean [SD]) | 43.87 (14.36) | 39.99 (14.64)1 | 41.75 (13.37)2 | 51.77 (13.10)1,2 | 31.397 a | 0.000 |
| Clinical characteristics | ||||||
| Severity of depression (mean [SD]) | 16.30 (5.13) | 14.33 (4.07)1,2 | 16.15 (5.14)1,3 | 18.42 (5.21)2,3 | 22.803 a | 0.000 |
| HDRS 8–16 (mild) (n [%]) | 297 (55.2%) | 96 (76.2%) | 154 (55.8%) | 47 (34.6%) | 52.996 | 0.000 |
| HDRS 17–23 (moderate) (n [%]) | 188 (34.9%) | 26 (20.6%) | 100 (36.2%) | 62 (45.6%) | ||
| HDRS ≥24 (severe) (n [%]) | 53 (9.9%) | 4 (3.2%) | 22 (8.0%) | 27 (19.9%) | ||
| Number of SA (mean [SD]) | – | 2.79 (3.89) | 2.53 (2.72) | – | 0.769 b | 0.443 |
| Age of first SA (mean [SD]) | – | 32.33 (14.93) | 32.75 (13.87) | – | −0.273 b | 0.785 |
| NLR (mean [SD]) | 2.12 (1.98) | 2.37 (2.36)1 | 2.22 (2.17)2 | 1.68 (0.80)1,2 | 10.630 c | 0.005 |
| MLR (mean [SD]) | 0.27 (0.14) | 0.28 (0.16) | 0.27 (0.15) | 0.25 (0.10) | 1.114 c | 0.573 |
| PLR (mean [SD]) | 123.37 (55.68) | 128.20 (61.65) | 127.76 (58.91)1 | 109.97 (38.75)1 | 7.487 c | 0.024 |
| Leukocytes (mean [SD]) | 7.15 (4.05) | 7.12 (2.65) | 7.24 (5.17) | 6.97 (2.03) | 0.061 c | 0.970 |
| Neutrophils (mean [SD]) | 4.01 (2.14) | 4.22 (2.79) | 4.05 (2.10) | 3.75 (1.39) | 1.024 c | 0.599 |
| Monocytes (mean [SD]) | 0.53 (0.19) | 0.52 (0.20) | 0.51 (0.19)1 | 0.56 (0.18)1 | 8.993 c | 0.011 |
| Lymphocytes (mean [SD]) | 2.22 (0.91) | 2.15 (1.10)1 | 2.16 (0.87)2 | 2.42 (0.77)1,2 | 14.482 c | 0.001 |
| Platelets (mean [SD]) | 243.02 (67.19) | 236.34 (60.64) | 245.36 (74.31) | 244.49 (57.00) | 1.584 c | 0.453 |
Abbreviations: HDRS, Hamilton Depression Rating Scale; MLR, monocyte-to-lymphocyte ratio; NLR, neutrophil-to-lymphocyte ratio; PLR, platelet-to-lymphocyte ratio; SA, suicide attempt; SD, standard deviation; χ 2, chi-square test.
Note: Superscript numerals represent statistically different groups after post hoc Duncan test.
a
One-way analysis of variance (ANOVA).
b
Student’s t-test.
c
Kruskal–Wallis test.