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Table 11 Linear regressions between headache-attributed disability1 and lost household worktime (HALT questions 3 + 4) by headache type and country

From: The relationship between headache-attributed disability and lost productivity: 2. Empirical evidence from population-based studies in nine disparate countries

Country

Migraine

Probable medication-overuse headache

R2

Equation

p

R2

Equation

p

China

0.15

Y = 1.04x + 3.8

< 0.001

–

–

–

Ethiopia

0.07

Y = 0.66x + 1.9

< 0.001

0.00

Y = 0.19x + 14.2

0.78

India

0.04

Y = 0.28x + 2.0

< 0.001

0.01

Y = 0.16x + 8.6

0.63

Lithuania + Luxembourg

0.12

Y = 0.73x + 1.7

< 0.001

0.01

Y = -0.28x + 20.4

0.60

Nepal

0.04

Y = 0.44x + 2.5

< 0.001

0.01

Y = 0.23x + 8.4

0.40

Pakistan

0.04

Y = 0.73x + 9.4

< 0.001

0.00

Y = -0.05x + 19.0

0.76

Russia

0.08

Y = 0.33x + 2.9

0.004

0.14

Y = 0.48x + 7.4

0.002

Spain

0.21

Y = 1.16x + 2.6

< 0.001

0.04

Y = 0.71x + 21.0

0.18

  1. 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.