Table 10.
Linear regressions between headache-attributed disability1 and lost paid worktime attributed to probable medication-overuse headache 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 | |
| Ethiopia | 0.06 | Y = 0.60x + 0.7 | 0.28 | 0.00 | Y = 0.01x + 8.4 | 0.98 | 0.02 | Y = 0.61x + 9.1 | 0.48 |
| India | 0.00 | Y = -0.09x + 3.6 | 0.77 | 0.15 | Y = 0.23x – 0.6 | 0.05 | 0.01 | Y = 0.14x + 3.0 | 0.70 |
| Lithuania + Luxembourg | 0.00 | Y = -0.04x + 2.0 | 0.81 | 0.04 | Y = 0.27x + 3.2 | 0.16 | 0.02 | Y = 0.25x + 4.9 | 0.37 |
| Nepal | 0.02 | Y = 0.23x + 3.1 | 0.28 | 0.03 | Y = 0.16x + 1.8 | 0.23 | 0.03 | Y = 0.39x + 4.9 | 0.23 |
| Pakistan | 0.08 | Y = -0.18x + 5.7 | 0.006 | 0.15 | Y = -0.25x + 7.0 | < 0.001 | 0.13 | Y = -0.43x + 12.5 | < 0.001 |
| Russia | 0.04 | Y = 0.14x – 0.05 | 0.11 | 0.00 | Y = 0.03x + 3.6 | 0.81 | 0.02 | Y = 0.16x + 3.5 | 0.31 |
| Spain | 0.01 | Y = 0.19x + 3.6 | 0.64 | 0.04 | Y = 0.47x + 8.0 | 0.19 | 0.03 | Y = 0.53x + 11.1 | 0.28 |
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.