Table 2.
Average volume and standard deviation (±SD) of unadjusted left and right hippocampal subfields in monozygotic twins (MZ), dizygotic twins (DZ), and non‐twin siblings
| Region | MZ average volume (mm3 ± SD) N = 100 | DZ average volume (mm3 ± SD) N = 94 | Non‐twin sibling average volume (mm3 ± SD) N = 271 | Total Sample average volume mm3 (± SD) N = 465 |
|---|---|---|---|---|
| Left CA1 | 755.71 (89.43) | 761.50 (74.00) | 780.82 (97.77) | 771.51 (92.15) |
| Right CA1 | 821.41 (90.97) | 826.97 (87.04) | 845.33 (103.51) | 836.47 (98.14) |
| Left CA2CA3 | 145.9705 (22.55) | 146.69 (21.56) | 149.04 (27.10) | 147.91 (25.12) |
| Right CA2CA3 | 174.82 (22.61) | 174.13 (24.04) | 182.61 (25.98) | 179.22 (25.18) |
| Left CA4DG | 623.61 (70.02) | 621.75 (55.12) | 649.06 (73.27) | 638.07 (70.34) |
| Right CA4GD | 615.00 (65.91) | 616.62 (55.99) | 649.88 (72.54) | 635.67 (70.00) |
| Left SRLM | 577.99 (67.90) | 581.60 (61.98) | 589.51 (73.93) | 585.44 (70.42) |
| Right SRLM | 543.56 (64.33) | 546.66 (63.48) | 558.37 (68.70) | 552.81 (66.94) |
| Left subiculum | 331.43 (46.22) | 327.84 (43.27) | 335.89 (50.83) | 333.31 (48.43) |
| Right subiculum | 329.45 (43.63) | 327.48 (38.08) | 333.92 (45.87) | 331.66 (43.92) |
| Left hippocampus | 2434.72 (253.57) | 2439.39 (216.75) | 2504.33 (277.15) | 2476.23 (262.56) |
| Right hippocampus | 2484.25 (249.13) | 2491.87 (233.02) | 2570.11 (277.67) | 2535.82 (265.78) |
| Total brain | 1344941.77 (138663.72) | 1351379.79 (117637.94) | 1393633.69 (150431.05) | 1374620.66 (143368.64) |