Table 2. Volumes of hippocampal and medial temporal cortical regions of interest per 5-HTTLPR allele group.

Brain regional volume (mm3)	5-HTTLPR genotype		P
	ll Group (N=16), mean (s.d.)	ss/sl Group (N=20), mean (s.d.)
Total brain volume	1146.52 (92.09)	1152.83 (120.64)	0.86
Right perirhinal cortex	0.0302 (0.0087)	0.0317 (0.0084)	0.61
Left perirhinal cortex	0.0327 (0.0072)	0.0356 (0.0107)	0.33
Right entorhinal cortex	0.0224 (0.0069)	0.0222 (0.0056)	0.95
Left entorhinal cortex	0.0205 (0.0041)	0.0227 (0.0053)	0.17
Right parahippocampal gyrus	0.0351 (0.0092)	0.0322 (0.0045)	0.26
Left parahippocampal gyrus	0.0346 (0.0067)	0.0334 (0.0077)	0.62
Right CA1 subregion	0.0103 (0.0028)	0.0099 (0.0017)	0.71
Left CA1 subregion	0.0087 (0.0019)	0.0088 (0.0019)	0.95
Right CA23DG subregion	0.0303 (0.0091)	0.0312 (0.0062)	0.73
Left CA23DG subregion	0.0263 (0.0064)	0.0273 (0.0062)	0.66
Right subiculum subregion	0.0116 (0.0029)	0.0110 (0.0021)	0.50
Left subiculum subregion	0.0116 (0.0026)	0.0109 (0.0025)	0.40

Abbreviations: DG, dentate gyrus; 5-HTTLPR, serotonin transporter gene; l, long allele; s, short allele; s.d., standard deviation. CA1 and CA23DG indicate subregions of the hippocampus.