The psychometric properties of PHQ-4 anxiety and depression screening scale among out of school adolescent girls and young women in Tanzania: a cross-sectional study

Table 3 Item Internal consistency of the scales

Over the last 2 weeks, how often have you been bothered by the following problems
	^a4-Item alpha	2-Item alpha	^balpha if item- dropped
Anxiety (GAD-2)
1. Feeling nervous, anxious or on edge	0.81	0.74	0.75
2. Not being able to stop or control worrying			0.74
Depression (PHQ-2)			0.77
3. Little interest or pleasure in doing things		0.65	0.77
4. Feeling down, depressed or hopeless

^aThe overall alpha (Cronbach’s α: Indicates the internal reliability of the four items (conducted with the entire sample)); ^bValues of the overall alpha (Cronbach’s) if that item isn’t included in the calculation

ISSN: 1471-244X