Table 14 Interpretation of regressions between total lost productivity (LP) and migraine-attributed disability (maD) in all countries ordered by increasing population mean maD

World Bank income ranking [54]

lower middle

lower middle

lower middle

upper middle

low

upper middle

high

high

Population mean maD¹ (%)

2.0

2.6

2.6

3.1

3.5

3.8

3.9

4.1

Regression equation² (Y=)

1.11x + 11.5

0.46x + 4.4

0.69x + 2.7

0.44x + 4.8

0.79x + 4.1

1.66x + 7.6

0.96x + 3.0

1.69x + 5.3

Population-level LP³ (Y):

Y₁ where x = maD

13.72

5.60

4.49

6.16

6.87

13.91

6.74

12.23

Y₂ where x = 0.5*maD⁴

12.61

5.00

3.60

5.48

5.48

10.75

4.87

8.76

Y₂/Y₁

0.92

0.89

0.80

0.89

0.80

0.77

0.72

0.72

Recovery of LP for 50% reduction in maD (%)⁵

8

11

20

11

20

23

28

28

Pro rata recovery of LP per unit reduction in maD

0.16

0.22

0.40

0.22

0.40

0.46

0.56

0.56