Table 1. Demographic characteristics of cases, age-matched controls and past lifetime risk controls.
Characteristic | Cases (%) | Age-matched controls (%) | 1936 Controls (%) |
---|---|---|---|
Number | 88 | 88 | 87 |
Sex | |||
Female | 64 (72.7) | 62 (70.5) | 61 (70.1) |
Male | 24 (27.3) | 26 (29.5) | 26 (29.9) |
Female:male ratio | 2.67:1 | 2.34:1 | 2.35:1 |
Place of residence | |||
Orkney | 37 (42) | 54 (61) | 55 (63) |
Shetland | 21 (24) | 29 (33) | 30 (34) |
Grampian | 16 (18) | 4 (5) | 0 (0) |
Highland | 7 (8) | 0 (0) | 1 (1) |
Lothian | 4 (5) | 1 (1) | 1 (1) |
Fife | 1 (1) | 0 (0) | 0 (0) |
Strathclyde | 1 (1) | 0 (0) | 0 (0) |
USA | 1 (1) | 0 (0) | 0 (0) |
Age (years) | |||
Age at onset of disease | |||
Mean (n=87) | 32 | ||
Range | 8–63 | ||
Age at diagnosis | |||
Mean (n=85) | 40 | ||
Range | 8–76 | ||
Age at time of interview | |||
Mean | 50.7 | 50 | 72.8 |
Range | 27.4–77.0 | 26.9–76.7 | 70.1–89.2 |
Disease course | |||
Relapsing-remitting type | 35 (39.8) | ||
Secondary progressive – with relapses | 26 (29.5) | ||
Secondary progressive – without relapses | 15 (17.0) | ||
Primary progressive | 12 (13.6) | ||
Clinically isolated syndrome | 0 (0) | ||
Expanded disability status score | |||
<3 | 27 (30.7) | ||
3–<6 | 12 (13.6) | ||
6–<7 | 29 (33.0) | ||
≥7 | 20 (22.7) |