. 2017 Apr 20;12(4):e0175800. doi: 10.1371/journal.pone.0175800

Table 3. Twin intra-pair analyses.

		Mean Intra-pair Difference			Intra-pair Correlation
Region	Volume	Monozygotic	Dizygotic	Sig. Diff.	Monozygotic	95% CI	Dizygotic	95% CI
Brain	Total	25.7	93.4	^**	0.939^**	0.85, 0.98	0.478	-0.023, 0.79
	Right	13.1	53.7	^**	0.923^**	0.81, 0.97	0.424	-0.091, 0.76
	Left	12.5	43.4	^**	0.919^**	0.80, 0.97	0.487	-0.012, 0.79
	TGM	19.8	54.5	^**	0.955^**	0.89, 0.98	0.647^**	0.22, 0.87
	RGM	10.1	26.0	^**	0.936^**	0.84, 0.97	0.653^**	0.23, 0.87
	LGM	10.4	25.0	^**	0.935^**	0.84, 0.97	0.667^**	0.26, 0.87
	TWM	19.7	45.1	^**	0.871^**	0.70, 0.95	0.358	-0.17, 0.73
	RWM	9.39	31.6	^**	0.884^**	0.73, 0.95	0.127	-0.39, 0.59
	LWM	10.4	22.0	^**	0.851^**	0.65, 0.94	0.366	-0.16, 0.73
	CSF	30.4	49.7	^**	0.866^**	0.69, 0.95	0.876^**	0.67, 0.96
Cerebrum	Total	21.9	79.5	^**	0.927^**	0.82, 0.97	0.482	-0.018, 0.79
	Right	11.6	39.9	^**	0.923^**	0.81, 0.97	0.496	0.00030, 0.80
	Left	11.1	39.0	^**	0.924^**	0.81, 0.97	0.462	-0.043, .78
	TGM	17.8	45.5	^**	0.942^**	0.86, 0.98	0.666^**	0.25, 0.87
	RGM	9.46	23.0	^**	0.933^**	0.83, 0.97	0.665^**	0.25, 0.87
	LGM	8.81	22.0	^**	0.946^**	0.87, 0.98	0.659^**	0.24, 0.87
	TWM	17.7	41.7	^**	0.878^**	0.71, 0.95	0.339	-0.19, 0.71
	RWM	8.33	20.8	^**	0.896^**	0.75, 0.96	0.332	-0.20, 0.71
	LWM	9.54	20.8	^**	0.855^**	0.66, 0.94	0.348	-0.18, 0.72
Cerebellum	Total	3.17	9.26	^**	0.881^**	0.72, 0.95	0.394	-0.13, 0.74
	Right	2.28	5.13	^**	0.823^**	0.60, 0.93	0.342	-0.18, 0.72
	Left	2.38	4.45	^**	0.788^**	0.53, 0.91	0.445	-0.066, 0.77
	TGM	3.23	7.57	^**	0.884^**	0.72, 0.95	0.448	-0.062, 0.77
	RGM	1.93	4.07	^**	0.844^**	0.64, 0.94	0.425	-0.089, 0.76
	LGM	2.20	3.74	^*	0.754^**	0.47, 0.90	0.466	-0.039, 0.78
	TWM	1.72	2.78	^**	0.870^**	0.70, 0.95	0.733^**	0.37, 0.90
	RWM	0.933	1.46	^**	0.843^**	0.64, 0.94	0.697^**	0.31, 0.89
	LWM	0.863	1.37	^*	0.855^**	0.66, 0.94	0.753^**	0.41, 0.91
Frontal	Total	12.6	33.5	^**	0.922^**	0.81, 0.97	0.483	-0.017, 0.79
	Right	9.07	13.6	^*	0.826^**	0.61, 0.93	0.573^*	0.11, 0.83
	Left	7.38	20.3	^**	0.926^**	0.82,0.97	0.302	-0.23, 0.69
	TGM	7.57	18.1	^**	0.937^**	0.85, 0.98	0.667^**	0.26, 0.87
	RGM	5.07	8.14	^**	0.864^**	0.68, 0.95	0.709^**	0.33, 0.89
	LGM	4.01	10.8	^**	0.956^**	0.89, 0.98	0.566^*	0.10, 0.83
	TWM	6.28	18.8	^**	0.912^**	0.79, 0.97	0.346	-0.18, 0.72
	RWM	4.25	7.90	^**	0.834^**	0.62, 0.93	0.485	-0.014, 0.79
	LWM	4.25	11.1	^**	0.880^**	0.72, 0.95	0.119	-0.40, 0.58
Temporal	Total	4.63	19.0	^**	0.954^**	0.89, 0.98	0.433	-0.08, 0.76
	Right	2.92	9.28	^**	0.923^**	0.81, 0.97	0.409	-0.11, 0.75
	Left	2.70	9.69	^**	0.954^**	0.88, 0.98	0.454	-0.054, 0.78
	TGM	4.27	10.6	^**	0.943^**	0.86, 0.98	0.494	-0.0017, 0.80
	RGM	2.48	5.00	^**	0.910^**	0.78, 0.96	0.449	-0.060, 0.77
	LGM	2.14	5.70	^**	0.949^**	0.87, 0.98	0.517^*	0.028, 0.81
	TWM	3.49	9.02	^**	0.922^**	0.81, 0.97	0.431	-0.082, 0.76
	RWM	1.61	4.76	^**	0.922^**	0.81, 0.70	0.404	-0.11, 0.75
	LWM	2.24	4.27	^**	0.882^**	0.72, 0.95	0.459	-0.047, 0.78
Parietal	Total	5.55	16.6	^**	0.896^**	0.75, 0.96	0.355	-0.17, 0.72
	Right	3.02	8.80	^**	0.857^**	0.67, 0.94	0.359	-0.17, 0.73
	Left	3.31	8.08	^**	0.869^**	0.69, 0.95	0.331	-0.20, 0.71
	TGM	4.44	8.91	^**	0.888^**	0.73, 0.96	0.594^*	0.14, 0.84
	RGM	2.15	4.76	^**	0.861^**	0.68, 0.94	0.589^*	0.13, 0.84
	LGM	2.38	4.40	^**	0.866^**	0.69, 0.95	0.574^*	0.11, 0.83
	TWM	3.67	9.60	^**	0.923^**	0.81, 0.97	0.383	-0.14, 0.74
	RWM	2.12	4.85	^**	0.888^**	0.73, 0.96	0.362	-0.16, 0.73
	LWM	2.31	4.95	^**	0.904^**	0.77, 0.96	0.394	-0.13, 0.74
Occipital	Total	5.94	12.7	^**	0.757^**	0.47, 0.90	0.495	-0.00066, 0.80
	Right	4.16	8.91	^**	0.561^*	0.16, 0.80	0.017	-0.51, 0.48
	Left	5.04	5.17	-	0.626^**	0.25, 0.84	0.708^**	0.33, 0.89
	TGM	3.34	6.72	^**	0.743^**	0.45, 0.85	0.557^*	0.085, 0.83
	RGM	2.07	5.33	^**	0.650^**	0.29, 0.85	0.103	-0.41, 0.57
	LGM	3.05	3.14	-	0.563^**	0.16, 0.81	0.635^**	0.20, 0.86
	TWM	3.42	6.20	^**	0.834^**	0.62, 0.93	0.659^**	0.24, 0.87
	RWM	2.43	3.87	^**	0.666^**	0.32, 0.86	0.248	-0.28, 0.66
	LWM	2.45	2.56	-	0.760^**	0.48, 0.90	0.804^**	0.51, 0.93
Brainstem	Total	1.34	2.40	^**	0.838^**	0.63, 0.93	0.693^**	0.30, 0.88
	Right	0.700	1.22	^**	0.843^**	0.64, 0.94	0.663^**	0.25, 0.87
	Left	0.693	1.20	^**	0.806^**	0.57, 0.92	0.706^**	0.32, 0.89

T = total, R = right, L = left, GM = grey matter, WM = white matter, CSF = cerebrospinal fluid. Volumes are adjusted for ICV and expressed in cm³;

- indicates p≥0.05;

* indicates p<0.05;

** indicates p<0.01.