Description: | Visual changes develop slowly before or near the onset of headaches |
Category: | Experience of pain ⏴ Online follow-up |
Participants | 21,316 | Value Type | Categorical (single) | Sexed | Both sexes | Debut | Dec 2020 | |||
Item count | 21,316 | Item Type | Data | Instances | Singular | Version | Dec 2020 | |||
Stability | Accruing | Strata | Primary | Array | No | Cost Tier | d1 o1 s1 |