Table 2.
Item endorsement frequencies and performance on validators for the three-class LCA solution for nine DSM-IV MD A criteriaa
| Item description | Severe | Non-suicidal | Moderate | F/χ 2 | Cramér’s V/η2 |
|---|---|---|---|---|---|
| Class counts | 5140 | 482 | 386 | ||
| Class proportions (%) | 85.6 | 8.0 | 6.4 | ||
| A1. Depressed mood | 1.00 | 0.99 | 0.95 | 0.25 | |
| A2. Anhedonia | 1.00 | 0.98 | 0.94 | 0.23 | |
| A3. Changes in weight/appetite | 0.94 | 0.86 | 0.68 | 0.34 | |
| A4. Sleep changes | 0.97 | 0.93 | 0.84 | 0.25 | |
| A5. Psychomotor changes | 0.96 | 0.91 | 0.50 | 0.57 | |
| A6. Fatigue | 0.96 | 0.96 | 0.69 | 0.38 | |
| A7. Worthless/guilty | 0.96 | 0.63 | 0.70 | 0.54 | |
| A8. Concentration problems | 1.00 | 0.99 | 0.81 | 0.49 | |
| A9. Suicidal ideation | 0.89 | 0.00 | 0.57 | 0.56 | |
| Continuous validators | F | η 2 | |||
| Age | 44.56 (0.12) | 44.16 (0.41) | 43.04 (0.45) | 10.34* | 0.00 |
| Body mass index | 22.78 (0.05) | 22.57 (0.14) | 22.52 (0.18) | 3.35 | 0.00 |
| Age of onset | 34.84 (0.14) | 35.68 (0.44) | 33.90 (0.49) | 0.57 | 0.00 |
| Duration of the worst episode | 48.49 (1.29) | 45.03 (3.58) | 43.07 (4.55) | 1.71 | 0.00 |
| Neuroticism | 13.20 (0.08) | 9.91 (0.25) | 9.84 (0.29) | 204.17** | 0.03 |
| Number of episodes | 4.73 (0.10) | 3.80 (0.28) | 3.58 (0.23) | 14.83** | 0.00 |
| Stressful life events | 1.59 (0.02) | 1.33 (0.07) | 1.49 (0.08) | 5.17 | 0.00 |
| Binary external validators (%) | χ 2 | Cramér’s V | |||
| Childhood sexual abuse | 10.4 (0.4) | 8.7 (1.3) | 10.2 (1.6) | 1.39 | 0.02 |
| Dysthymia | 10.2 (0.4) | 6.7 (1.1) | 9.2 (1.5) | 6.30 | 0.03 |
| Family history | 27.5 (0.6) | 24.2 (2.0) | 21.2 (2.1) | 8.57 | 0.04 |
| Generalized anxiety disorder | 27.3 (0.6) | 15.6 (1.7) | 15.1 (1.8) | 54.69** | 0.10 |
| Panic disorder | 7.4 (0.4) | 4.0 (0.9) | 2.4 (0.8) | 20.12** | 0.06 |
| Phobia | 41.2 (0.7) | 31.4 (2.1) | 28.3 (2.3) | 39.00** | 0.08 |
LCA, Latent class analysis; MD, major depression.
a
For binary external validators, frequencies (and standard errors) are reported for each class, Cramér’s V as the effect size and χ2 and p values; for quantitative external validators, means (and standard errors) are reported for each class, along with η2 as the effect size, and F and p values for the ANOVA.
*
p<0.005,
**
p<0.0005, otherwise p ≥ 0.01.