Table 3.
Item endorsement frequencies for the four-class LCA solution for the 14-item disaggregated DSM-IV MD A criteriaa
| Items description | Severe typical |
Moderate typical |
Non-suicidal | Atypical | F/χ 2 | Cramér’s V/η2 |
|---|---|---|---|---|---|---|
| Class counts | 4228 | 818 | 520 | 442 | ||
| Class proportions (%) | 70.4 | 13.6 | 8.7 | 7.4 | ||
| Depressed mood | 1.00 | 0.98 | 0.98 | 1.00 | 0.13 | |
| Anhedonia | 1.00 | 0.97 | 0.96 | 0.99 | 0.16 | |
| Loss of appetite | 0.98 | 0.31 | 0.93 | 0.57 | 0.79 | |
| Loss of weight | 0.72 | 0.12 | 0.72 | 0.31 | 0.46 | |
| Increase of appetite | 0.03 | 0.08 | 0.01 | 0.83 | 0.71 | |
| Increase of weight | 0.01 | 0.03 | 0.00 | 0.73 | 0.85 | |
| Insomnia | 0.96 | 0.83 | 0.91 | 0.87 | 0.20 | |
| Hypersomnia | 0.11 | 0.15 | 0.08 | 0.37 | 0.21 | |
| Psychomotor retardation | 0.86 | 0.54 | 0.50 | 0.80 | 0.35 | |
| Psychomotor agitation | 0.81 | 0.54 | 0.54 | 0.75 | 0.27 | |
| Fatigue | 0.98 | 0.84 | 0.87 | 0.92 | 0.27 | |
| Worthless/guilty | 0.98 | 0.85 | 0.55 | 0.94 | 0.68 | |
| Concentration problems | 1.00 | 0.93 | 0.91 | 0.99 | 0.30 | |
| Suicidal Ideation | 0.87 | 0.64 | 0.40 | 0.79 | 0.37 | |
| Continuous validators | F | η 2 | ||||
| Age | 44.87 (0.14) | 42.95 (0.31) | 45.12 (0.38) | 42.14 (0.41) | 47.59**** | 0.01 |
| Body mass index | 22.67 (0.05) | 22.78 (0.11) | 22.41 (0.14) | 23.82 (0.18) | 11.4*** | 0.00 |
| Age of onset | 35.23 (0.15) | 33.31 (0.34) | 36.39 (0.42) | 32.2 (0.46) | 55.16**** | 0.01 |
| Duration of the worst episode | 45.83 (1.36) | 49.36 (2.91) | 42.46 (4.04) | 70.87 (5.84) | 7.53* | 0.00 |
| Neuroticism | 13.08 (0.09) | 11.99 (0.21) | 9.35 (0.23) | 14.54 (0.26) | 12 95**** | 0.00 |
| Number of episodes | 4.71 (0.11) | 4.09 (0.20) | 3.65 (0.24) | 5.42 (0.38) | 0.02 | 0.00 |
| Stressful life events | 1.54 (0.03) | 1.55 (0.06) | 1.34 (0.07) | 2.03 (0.10) | 7.76* | 0.00 |
| Binary external validators (%) | χ 2 | Cramér’s V | ||||
| Childhood sexual abuse | 9.5 (0.5) | 12.9 (1.2) | 9.2 (1.3) | 13.5 (1.6) | 13.89** | 0.05 |
| Dysthymia | 9.7 (0.5) | 11.5 (1.1) | 5.8 (1.0) | 12.8 (1.6) | 15.93** | 0.05 |
| Family history | 27.2 (0.7) | 24.5 (1.5) | 24.5 (1.9) | 29.4 (2.2) | 5.29 | 0.03 |
| Generalized anxiety disorder | 27.1 (0.7) | 21.9 (1.5) | 12.8 (1.5) | 33.4 (2.3) | 68.2**** | 0.11 |
| Panic disorder | 7.6 (0.4) | 4.1 (0.7) | 4.1 (0.9) | 6.9 (1.2) | 19.25**** | 0.06 |
| Phobia | 41.2 (0.8) | 33.3 (1.7) | 30.7 (2.0) | 46.0 (2.4) | 42.06**** | 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<0.01,
**
p<0.005,
***
p<0.001,
****
p<0.0005, otherwise p ≥ 0.01.