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Household selection for the study.
| Area | Neighbourhoods | Number of participants | Family size | Residential status |
|---|---|---|---|---|
| Zone 1 | Al Sabil, Al-Muhajirin, Al Abbasiah, Al Zahra, and Al Arman | 75 | 6.10 | Low-income areas |
| Zone 2 | Wadi Aldahab, New Akrama, Karam el-Zeitoun, and Karam el-Looz | 75 | 6.15 | Lower-middle-income areas |
| Zone 3 | Al Inshaat, Al-Mahatta, and Al-Shammas | 75 | 5.95 | Upper-middle-income areas |
| Zone 4 | Al-Ghouta and Al Boughtassia | 75 | 5.90 | High-income areas |
