Table 1.
Baseline characteristics for the whole cohort including data from all patient visits (n = 66). Data presented as median, interquartile range (IQR) or percentage (visits) where specified.
| Characteristic | Median (interquartile range) |
|---|---|
| Age at baseline | 31 (25–35) |
| BMI (kg/m2) | 39 (35–47) |
| Weight (kg) | 107 (93–120) |
| Pre-LP headache severity (NRS) | 4 (1–6) (mean 3.6 (SD: 2.8)) |
| LP opening (cmCSF) | 32 (28–37) |
| LP closing (cmCSF) | 19 (17–21) |
| Amount CSF drained (ml) | 10 (10–12) |
| RBC in CSF (cmm)# | 7 (1–36) |
| Depth from skin to CSF (mm) as measured by ultrasound## | 67 (61–74) |
| Frisén Grade | Right eye 2 (1–2) Left eye 2 (1–3) |
| Percentage (visits) |
|
| Ethnicity | |
| White | 91% (60) |
| Mixed/multiple ethnic group | 5% (3) |
| Asian/Asian British | 3% (2) |
| Black/African/Caribbean | 2% (1) |
| Analgesic on day### | 24% (11) |
| Headache preventative therapy | 24% (16) |
| Acetazolamide | 27% (18) |
| Headache phenotypes* | |
| Migraine-like and probable migraine-like | 80% (53) |
| Attributed to IIH | 35% (23) |
| Tension type-like | 14% (9) |
| Other | 8% (5) |
| Not classifiable | 11% (7) |
Note: Where data is missing, the number of visits included is indicated as # = 61, ## = 22, ### = 46.
*
Patients may have experienced more than one headache phenotype at baseline. Headaches exist in the setting of active IIH thus are not a primary headache; the phenotype of the headaches are classified according to the ICHD-3 beta.