Table 2.
Internal consistency and test-retest reliability of the interviewer and SMS text messaging assessments.
| Assessment mode | Internal consistency (Cronbach alpha) | Test-retest reliability (intraclass correlation coefficient) | ||||
| Interviewer assessment | ||||||
|
|
Depression |
|
|
|||
|
|
|
PHQ-2a | .71 | 0.76 | ||
|
|
|
PHQ-8b | .86 | 0.78 | ||
|
|
Anxiety (GAD-2c) | .82 | 0.75 | |||
|
|
Functional disability (SDSd) | .80 | 0.47 | |||
| SMS text messaging assessment | ||||||
|
|
Depression |
|
|
|||
|
|
|
PHQ-2 | .68 | 0.74 | ||
|
|
|
PHQ-8 | .86 | 0.81 | ||
|
|
Anxiety (GAD-2) | .71 | 0.73 | |||
|
|
Functional disability (SDS) | .86 | 0.82 | |||
aPHQ-2: 2-item Patient Health Questionnaire.
bPHQ-8: 8-item Patient Health Questionnaire.
cGAD-2: 2-item Generalized Anxiety Disorder scale.
dSDS: Sheehan Disability Scale.