Table 12.
Linear regressions between headache-attributed disability1 and total lost productivity (HALT questions 1 + 2 + 3 + 4) by headache type and country
| Country | Migraine | Probable medication-overuse headache | ||||
|---|---|---|---|---|---|---|
| R2 | Equation | p | R2 | Equation | p | |
| China | 0.14 | Y = 1.66x + 7.6 | < 0.001 | – | – | – |
| Ethiopia | 0.07 | Y = 0.79x + 4.1 | < 0.001 | 0.06 | Y = 1.04x + 18.5 | 0.28 |
| India | 0.13 | Y = 0.69x + 2.7 | < 0.001 | 0.01 | Y = 0.30x + 11.6 | 0.58 |
| Lithuania + Luxembourg | 0.10 | Y = 0.96x + 3.0 | < 0.001 | 0.00 | Y = 0.004x + 22.5 | 0.99 |
| Nepal | 0.02 | Y = 0.46x + 4.4 | < 0.001 | 0.02 | Y = 0.51x + 13.5 | 0.27 |
| Pakistan | 0.06 | Y = 1.11x + 11.5 | < 0.001 | 0.00 | Y = -0.10x + 23.3 | 0.56 |
| Russia | 0.07 | Y = 0.44x + 4.8 | 0.007 | 0.11 | Y = 0.64x + 10.9 | 0.008 |
| Spain | 0.18 | Y = 1.69x + 5.3 | < 0.001 | 0.04 | Y = 0.89x + 30.0 | 0.14 |
HALT: Headache-Attributed Lost Time questionnaire. 1 Calculated as proportion of time in ictal state*disability weight from GBD2015 [49]; significant p-values are emboldened.