Country | Migraine | Probable medication-overuse headache | ||||
---|---|---|---|---|---|---|
N | rs | p | N | rs | p | |
China | 203 | 0.27 | < 0.001 | – | – | – |
Ethiopia | 479 | 0.28 | < 0.001 | 23 | 0.05 | 0.82 |
India | 372 | 0.05 | 0.30 | 27 | −0.08 | 0.69 |
Lithuania + Luxembourg | 543 | 0.30 | < 0.001 | 58 | −0.03 | 0.85 |
Nepal | 674 | 0.12 | 0.003 | 53 | 0.17 | 0.22 |
Pakistan | 483 | 0.23 | < 0.001 | 104 | −0.04 | 0.72 |
Russia | 108 | 0.27 | 0.005 | 64 | 0.39 | 0.002 |
Spain | 355 | 0.39 | < 0.001 | 54 | 0.19 | 0.17 |