Introduction
Numerical example
Exposed (n = 10,000) | Unexposed (n = 10,000) | |
---|---|---|
Female gender | 5,000 (50%) | 5,000 (50%) |
Old age | 7,500 (75%) | 2,500 (25%) |
Young men | Exposed (n = 2,000) | Unexposed (n = 2,000) | Young women | Exposed (n = 500) | Unexposed (n = 3,000) | ||
---|---|---|---|---|---|---|---|
Outcome | Yes | 100 | 450 | Outcome | Yes | 50 | 600 |
No | 1900 | 4050 | No | 450 | 2400 | ||
RR = 0.50 | RR = 0.50 |
Old men | Exposed (n = 3,000) | Unexposed (n = 500) | Old women | Exposed (n = 4,000) | Unexposed (n = 2,000) | ||
---|---|---|---|---|---|---|---|
Outcome | Yes | 300 | 100 | Outcome | Yes | 900 | 800 |
No | 2700 | 400 | No | 3600 | 1200 | ||
RR = 0.50 | RR = 0.50 |
Clinical example
Patient characteristics | Ever LABA-users (n = 795) | Never LABA-users (n = 1599) |
P value†
|
---|---|---|---|
Old age (%) | 402 (50.6) | 628 (39.3) | <0.001 |
Cardiovascular co-morbidity status | 158 (19.9) | 318 (19.9) | 0.99 |
Female gender (%) | 378 (47.5) | 759 (47.5) | 0.98 |
Stratum | Number of subjects | Number of ever LABA-users | Mortality | RR (95% CI)a
|
---|---|---|---|---|
Young age, co-morbidity absent | 1286 | 370 (28.8) | 10 (0.8) | 1.06 (0.28–4.08) |
Young age, co-morbidity present | 77 | 23 (29.9) | 7 (9.1) | 1.76 (0.43–7.25) |
Old age, co-morbidity absent | 631 | 267 (42.3) | 110 (17.4) | 1.10 (0.78–1.54) |
Old age, co-morbidity present | 399 | 135 (33.8) | 126 (31.6) | 0.88 (0.64–1.20) |