| N | nGMV (cc) mean (SD) | nWMV (cc) mean (SD) | nBV (cc) mean (SD) | |
| Controls | 49 | 941 (52) | 590 (32) | 1531 (62) |
| CIS patients | 41 | 940 (52) | 579 (32) | 1520 (63) |
cc, cubic centimetres; nBV, normalised brain volume; nGMV, normalised grey matter volume; nWMV, normalised white matter volume; SD, standard deviation.