Background
The current study
Method
Participants
Procedure
Measures used
Results
Participants reaching diagnostic criteria on the PHQ
Internal consistency
Measure | Total Sample | Non-Clinical Sample | Clinical Sample | |||
---|---|---|---|---|---|---|
DASS42 | ||||||
Depression Subscale | 7.16 (8.76) | Normal | 5.47 (6.83) | Normal | 12.77 (11.70) | Mild |
Anxiety Subscale | 4.94 (5.61) | Normal | 3.80 (4.29) | Normal | 8.74 (7.55) | Mild |
Stress Subscale | 10.93 (8.25) | Normal | 9.29 (6.57) | Normal | 16.34 (10.65) | Mild |
SAS Total Raw Score | 34.09 (8.18) | Normal | 32.54 (7.36) | Normal | 39.25 (8.66) | Clinically Significant |
SDS Total Raw Score | 38.41 (9.43) | Normal | 36.67 (8.32) | Normal | 44.21 (10.55) | Mild - Moderate |
Comparing the Zung and DASS scales’ predictive ability
Ability to predict depression
A. DASS Depression Subscale only (Nagelkerke R
2
= .58) | ||||
b
| Sig. | Odds Ratio |
SS
ΔP
| |
DASS Depression Scale | .235 | <.001 | 1.264 | .286 |
B. Zung SDS only (Nagelkerke R
2
= .49) | ||||
b
| Sig. | Odds Ratio |
SS
ΔP
| |
SDS
| .212 | <.001 | 1.236 | .278 |
C. Both scales entered as predictors (Nagelkerke R
2
= .60) | ||||
b
| Sig. | Odds Ratio |
SS
ΔP
| |
DASS Depression Scale | .173 | <.001 | 1.189 | .209 |
SDS | .090 | .008 | 1.094 | .116 |
Ability to predict anxiety
A. DASS Anxiety Subscale only (Nagelkerke R
2
= .47) | ||||
b
| Sig. | Odds Ratio |
SS
ΔP
| |
DASS Anxiety Scale | .297 | <.001 | 1.346 | .211 |
B. Zung SAS only (Nagelkerke R
2
= .40) | ||||
b
| Sig. | Odds Ratio |
SS
ΔP
| |
SAS
| .196 | <.001 | 1.217 | .202 |
C. Both scales entered as predictors (Nagelkerke R
2
= .49) | ||||
b
| Sig. | Odds Ratio |
SS
ΔP
| |
DASS Anxiety Scale | .215 | <.001 | 1.240 | .151 |
SAS | .082 | .016 | 1.085 | .083 |
Comparison of the DASS and Zung scales’ discriminant ability
A. The DASS subscales (Nagelkerke R
2
= .59) | ||||
b
| Sig. | Odds Ratio |
SS
ΔP
| |
DASS Depression Scale | .209 | <.001 | 1.232 | .253 |
DASS Anxiety Scale | −.023 | .631 | 0.997 | −.026 |
DASS Stress Scale | .062 | .067 | 1.064 | .070 |
B. The Zung scales (Nagelkerke R
2
= .52) | ||||
b
| Sig. | Odds Ratio |
SS
ΔP
| |
SDS | .147 | <.001 | 1.158 | .190 |
SAS | .095 | .005 | 1.100 | .106 |
A. The DASS subscales (Nagelkerke R
2
= .49) | ||||
b
| Sig. | Odds Ratio |
SS
ΔP
| |
DASS Anxiety Scale | .244 | <.001 | 1.276 | .172 |
DASS Depression Scale | .003 | .911 | 1.003 | .003 |
DASS Stress Scale | .050 | .124 | 1.051 | .051 |
B. The Zung scales (Nagelkerke R
2
= .41) | ||||
b
| Sig. | Odds Ratio |
SS
ΔP
| |
SAS | .167 | <.001 | 1.182 | .172 |
SDS | .033 | .256 | 1.033 | .038 |