Table 3 Gender standardised lifetime risk of chronic tension-type headache among first degree relatives and spouses of probands with chronic tension-type headache (data are from 17, 18]
No. of affected first degree relatives | Population relatives reisk | |||
|---|---|---|---|---|
Observed (O) | Expected (E) | Estimated (O/E) | 95% CI | |
Parents | 30 | 7.76 | 3.87 | 2.73–5.18 |
Siblings | 18 | 8.38 | 2.14 | 1.31–3.27 |
Children | 23 | 6.51 | 3.53 | 2.30–5.06 |
All first degree relatives | 71 | 22.61 | 3.14 | 2.50–3.86 |
Spouses | 4 | 4.85 | 0.82 | 0.23–2.68 |