Table 2.
Distribution of OFC sulcogyral patterns
| PGs (N = 165) | HCs (N = 159) | HCs from Chiavaras and Petridesb | χ2 | p Value | BF10 | |
|---|---|---|---|---|---|---|
| N (%) | N (%) | N (%) | ||||
| Left hemispherea | 5.29 | 0.071 | 1.17 | |||
| Type I | 65 (39) | 74 (47) | 24 (48) | 1.49 | 0.223 | 0.58 |
| Type II | 76 (46) | 55 (34) | 17 (34) | 4.88 | 0.027 | 3.12 |
| Type III | 19 (12) | 27 (17) | 9 (18) | 1.87 | 0.171 | 0.50 |
| Type IV | 5 (3) | 3 (2) | 0 (0) | |||
| Right hemispherea | 4.85 | 0.088 | 0.82 | |||
| Type I | 75 (45) | 84 (53) | 32 (64) | 1.39 | 0.238 | 0.56 |
| Type II | 72 (44) | 53 (33) | 13 (26) | 4.19 | 0.041 | 2.19 |
| Type III | 13 (8) | 20 (13) | 5 (10) | 1.81 | 0.179 | 0.41 |
| Type IV | 5 (3) | 2 (1) | 0 (0) | |||
| Total (L+R)a | 10.11 | 0.006 | 6.29 | |||
| Type I | 140 (42) | 158 (50) | 56 (56) | 2.88 | 0.090 | 0.83 |
| Type II | 148 (45) | 108 (34) | 30 (30) | 9.06 | 0.003 | 18.0 |
| Type III | 32 (10) | 47 (15) | 14 (14) | 3.65 | 0.056 | 0.80 |
| Type IV | 10 (3) | 5 (1) | 0 (0) |
Because pairwise group comparison analyses involved three statistical tests (one per OFC subtype), we used a Bonferroni-corrected significance threshold of 0.05/3 = 0.017
Statistically significant results (i.e. p < 0.017) are displayed in bold
PGs pathological gamblers, HCs healthy controls, BF Bayes Factor, L left, R right
aAnalyses comparing the distribution of OFC sulcogyral patterns between PGs and HCs in the present study
bData from the HCs (N = 50) of Chiavaras and Petrides (2000) are included in the table for ease of comparison