Table 1. Socioeconomic status (SES) questionnaire modified for Iranians .
| Category | Score |
| Education | |
| Professional or Honors | 7 |
| Graduate or Post-graduate | 6 |
| Intermediate or Post-High School Diploma | 5 |
| High School Certificate | 4 |
| Middle School Certificate | 3 |
| Primary School or Literate | 2 |
| Illiterate | 1 |
| Occupation | |
| Profession | 10 |
| Semi-Profession | 6 |
| Clerical, Shop-owner, Farmer | 5 |
| Skilled worker | 4 |
| Semi-skilled worker | 3 |
| Unskilled worker | 2 |
| Unemployed | 1 |
| Family Income per Month (in Rial)* | |
| ≥20000000 | 12 |
| 10000000-19999999 | 10 |
| 7500000-9999999 | 6 |
| 5000000-7499999 | 4 |
| 3000000-4999999 | 3 |
| 1000001-2999999 | 2 |
| ≤1000000 | 1 |
| Socioeconomic Class based on Total Score | |
| Upper | 26-29 |
| Middle | 11-25 |
| Lower | <10 |