Table 1. Measures of the Relative Effect of Migraine on Occupational Outcomes.
| Outcome | Migraine Severity | Mean | SE | Source |
| Current employment (full- or part-time) | Low EM (0-2 MHDs) [Reference] | Stewart et al (2010) | ||
| Moderate EM (3-9 MHDs) [RR] | 0.940 | 0.027 | ||
| High EM (10-14 MHDs) [RR] | 0.86 | 0.062 | ||
| CM (>14 MHDs) [RR] | 0.810 | 0.039 | ||
| EM (10-14 MHDs) [RR] | 0.993 | – | Calculateda | |
| Full-time/part-time ratio | EM (≤ 14 MHDs) | 52.3% | 0.5% | Buse et al (2010) |
| CM (>14 MHDs) | 37.8% | 1.9% | ||
| CM vs EM [RR] | 0.723 | -- | Calculatedb | |
| Absenteeism (% work time missed) | Controls (no migraine) | 1.9% | 10%c | See noted |
| EM (4-7 MHDs) | 8.0% | Vo (2018)43 | ||
| EM (8-14 MHDs) | 22.2% | |||
| CM (>14 MHDs) | 19.7% | |||
| EM (≤ 14 MHDs) | 12.6% | – | Calculatede | |
| Disability | EM (≤ 14 MHDs) | 11.1% | 0.3% | Buse et al (2010) |
| CM (>14 MHDs) | 20.0% | 1.6% | ||
| CM vs EM [RR] | 1.802 | -- | Calculatedf | |
| Early retirement | HFEM (≥8 MHDs but <15 MHDs) | 20.8% | 3.2% | Chalmer (2020)44 |
| CM (≥8 MHDs but ≥15 MHDs) | 33.5% | 3.8% | ||
| CM vs EM [RR] | 1.611 | -- | Calculatedg |
aIt was assumed that having fewer than 10 MHDs would not affect one’s probability of staying in employment. Employment reductions was therefore applied only in people affected by EM having at least 10 MHDs and in those with CM. The proportion of EM with at least 10 MHDs (296/6267; 4.7%) was informed by Steward et al.45
bRatio between proportion of people with CM in full-time employment and EM in full-time employment (0.378/0.523).
cAssumed to be 10% of the mean.
Abbreviations: CM, chronic migraine; EM, episodic migraine; HFEM, high-frequency episodic migraine; MHDs, monthly headache days; RR, relative risk, SE, standard error.