Table 3 . Classical SES characteristics of 305 CHF patients and readmission status, Tehran, 2010–1 .
| Variable | Admitted within 12 months (n=122) | Not Admitted within 12 months (n=183) | P |
| Income level | <0.001 | ||
| Low | 84 (68.85) | 27 (14.75) | |
| Medium | 25 (20.49) | 105 (57.38) | |
| High | 13 (10.66) | 51 (27.87) | |
| Expenditure level | <0.001 | ||
| Low | 81 (66.39) | 32 (17.49) | |
| Medium | 14 (11.48) | 35 (19.13) | |
| High | 27 (22.13) | 116 (63.39) | |
| Education level | <0.001 | ||
| Illiterate/primary | 91 (74.59) | 68 (37.16) | |
| High school | 25 (20.49) | 71 (38.80) | |
| University degrees | 6 (4.92) | 44 (24.04) | |
| Occupation position | <0.001 | ||
| First (Professional) | 29 (23.70) | 83 (45.36) | |
| 2th (Skilled workers) | 55 (45.08) | 78 (42.60) | |
| 3th (Semi-skilled/unskilled) | 38 (31.15) | 22 (12.02) |
SES= Socio-economic Status; CHF= Congestive Heart Failure