Incidence density rates and ratios for headaches according to exposure (E): adjusted and unadjusted for genotype (S)
| S+ | S− | Unstratified (collapsed) data | ||||
|---|---|---|---|---|---|---|
| E+ | E- | E+ | E- | E+ | E- | |
| Adapted from a table in Greenland.9 | ||||||
| Number | 1000 | 1000 | 1000 | 1000 | 2000 | 2000 |
| P years to first headache | 245 | 422 | 824 | 906 | 1069 | 1328 |
| Events | 982 | 865 | 339 | 181 | 1321 | 1046 |
| Rate per person | 4.0 | 2.0 | 0.4 | 0.2 | 1.24 | 0.79 |
| Exposure rate ratio | 2.0 | 2.1 | 1.6 | |||