Adjusted relative risk of death among PUB patients compared with the general population stratified by age groups
| Age | RR (95% CI)4-150 |
| 30–59 | 7.0 (3.1, 15.9) |
| 60–69 | 2.7 (1.6, 4.6) |
| 70–79 | 1.8 (1.2, 2.5) |
| 80–89 | 1.6 (1.1, 2.4) |
↵4-150 Adjusted by sex, cardiovascular, cerebrovascular, diabetes, respiratory diseases, smoking status, BMI and alcohol consumption.