HRs for rheumatoid arthritis (RA) among sampled patients during the 5-year follow-up period
| Presence of RA | Total sample, n=27 290 | Patients who received a diagnosis of GORD, n=13 645 | Comparison patients, n=13 645 |
| Five-year follow-up period | |||
| Yes, n (%) | 242 (0.89) | 186 (1.36) | 56 (0.41) |
| Incidence rate per 1000 person-years (95% CI) | 1.82 (1.60 to 2.06) | 2.81 (2.42 to 3.24) | 0.84 (0.64 to 1.09) |
| HR (95% CI) | – | 3.35*** (2.48 to 4.52) | 1.00 |
| Adjusted HR* (95% CI) | 2.84*** (2.09 to 3.85) | 1.00 | |
*Adjustments were made for the number of ambulatory care visits within 1 year after the index date.
The HR was calculated by a Cox proportional hazard regression.
***p<0.01.
GORD, gastro-oesophageal reflux disease.