| OCD (n = 23) | HC (n = 20) |  | |
---|---|---|---|---|
MRS metabolite | Mean ± SD (iu+) | Mean ± SD (iu) | t(df) | p |
 GABA+ | 2.41 ± 0.59 | 2.10 ± 0.35 | 2.05 (41) | 0.047* |
 Glx | 2.10 ± 0.49 | 2.23 ± 0.38 | −0.97 (41) | 0.34 |
 GABA+/Glx Ratio | 1.18 ± 0.30 | 0.96 ± 0.22 | 2.70 (41) | 0.01* |
Tissue composition | Mean Percentage ± SD | Mean ± SD | t(df) | p |
 Cerebral spinal fluid | 0.17 ± 0.02 | 0.16 ± 0.02 | 1.82 (41) | 0.0781 |
 Gray matter | 0.52 ± 0.03 | 0.52 ± 0.03 | / | 0.752 |
 White matter | 0.31 ± 0.04 | 0.32 ± 0.03 | 1.59 (41) | 0.3431 |