Table 9.
Linear regressions between headache-attributed disability1 and lost paid worktime attributed to migraine by country
| Country | HALT question 1 (absenteeism) | HALT question 2 (presenteeism) | HALT questions 1 + 2 (total lost paid worktime) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| R2 | Equation | p | R2 | Equation | p | R2 | Equation | p | |
| China | 0.04 | Y = 0.24x + 1.5 | 0.003 | 0.08 | Y = 0.45x + 2.4 | < 0.001 | 0.08 | Y = 0.69x + 3.9 | < 0.001 |
| Ethiopia | 0.00 | Y = 0.06x + 1.0 | 0.15 | 0.01 | Y = 0.08x + 1.2 | 0.07 | 0.01 | Y = 0.14x + 2.2 | 0.07 |
| India | 0.08 | Y = 0.24x + 0.4 | < 0.001 | 0.07 | Y = 0.17x + 0.2 | < 0.001 | 0.12 | Y = 0.41x + 0.6 | < 0.001 |
| Lithuania + Luxembourg | 0.00 | Y = 0.07x + 0.6 | 0.30 | 0.05 | Y = 0.30x + 0.8 | < 0.001 | 0.03 | Y = 0.32x + 1.4 | < 0.001 |
| Nepal | 0.00 | Y = 0.00x + 1.2 | 0.94 | 0.00 | Y = 0.02x + 0.8 | 0.57 | 0.00 | Y = 0.02x + 2.0 | 0.76 |
| Pakistan | 0.00 | Y = 0.08x + 3.2 | 0.34 | 0.01 | Y = 0.16x + 4.6 | 0.11 | 0.01 | Y = 0.21x + 7.4 | 0.15 |
| Russia | 0.00 | Y = -0.01x + 0.2 | 0.72 | 0.03 | Y = 0.13x + 1.6 | 0.09 | 0.02 | Y = 0.12x + 1.9 | 0.15 |
| Spain | 0.09 | Y = 0.25x + 0.3 | < 0.001 | 0.12 | Y = 0.50x + 2.4 | < 0.001 | 0.13 | Y = 0.69x + 2.8 | < 0.001 |
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.