Country | Migraine | Probable medication-overuse headache | ||||
---|---|---|---|---|---|---|
N | rs | p | N | rs | p | |
China | 203 | 0.28 | < 0.001 | – | – | – |
Ethiopia | 479 | 0.28 | < 0.001 | 23 | 0.34 | 0.12 |
India | 372 | 0.25 | < 0.001 | 27 | − 0.11 | 0.57 |
Lithuania + Luxembourg | 554 | 0.30 | < 0.001 | 62 | 0.08 | 0.52 |
Nepal | 674 | 0.11 | 0.004 | 53 | 0.09 | 0.50 |
Pakistan | 617 | 0.31 | < 0.001 | 115 | −0.14 | 0.14 |
Russia | 108 | 0.28 | 0.004 | 64 | 0.32 | 0.01 |
Spain | 367 | 0.37 | < 0.001 | 55 | 0.28 | 0.04 |