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Marked effects of intracranial volume correction methods on sex differences in neuroanatomical structures: a HUNT MRI study.

Pintzka CW, Hansen TI, Evensmoen HR, Håberg AK - Front Neurosci (2015)

Bottom Line: Sex differences were detected in a few structures; amygdala, cerebellar cortex, and 3rd ventricle were larger in men, but the effect sizes were small.The residuals and ANCOVA methods were most effective at removing the effects of ICV.Adding additional sexual dimorphic covariates to the ANCOVA gave opposite results of those obtained in the ICV-matched subsample or with the residuals method.

View Article: PubMed Central - PubMed

Affiliation: Department of Neuroscience, Norwegian University of Science and Technology Trondheim, Norway ; Department of Medical Imaging, St. Olav's University Hospital Trondheim, Norway.

ABSTRACT
To date, there is no consensus whether sexual dimorphism in the size of neuroanatomical structures exists, or if such differences are caused by choice of intracranial volume (ICV) correction method. When investigating volume differences in neuroanatomical structures, corrections for variation in ICV are used. Commonly applied methods are the ICV-proportions, ICV-residuals and ICV as a covariate of no interest, ANCOVA. However, these different methods give contradictory results with regard to presence of sex differences. Our aims were to investigate presence of sexual dimorphism in 18 neuroanatomical volumes unrelated to ICV-differences by using a large ICV-matched subsample of 304 men and women from the HUNT-MRI general population study, and further to demonstrate in the entire sample of 966 healthy subjects, which of the ICV-correction methods gave results similar to the ICV-matched subsample. In addition, sex-specific subsamples were created to investigate whether differences were an effect of head size or sex. Most sex differences were related to volume scaling with ICV, independent of sex. Sex differences were detected in a few structures; amygdala, cerebellar cortex, and 3rd ventricle were larger in men, but the effect sizes were small. The residuals and ANCOVA methods were most effective at removing the effects of ICV. The proportions method suffered from systematic errors due to lack of proportionality between ICV and neuroanatomical volumes, leading to systematic mis-assignment of structures as either larger or smaller than their actual size. Adding additional sexual dimorphic covariates to the ANCOVA gave opposite results of those obtained in the ICV-matched subsample or with the residuals method. The findings in the current study explain some of the considerable variation in the literature on sexual dimorphisms in neuroanatomical volumes. In conclusion, sex plays a minor role for neuroanatomical volume differences; most differences are related to ICV.

No MeSH data available.


Related in: MedlinePlus

Histograms showing the distributions of age, height and diastolic blood pressure in women (orange) and men (blue).
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Figure 3: Histograms showing the distributions of age, height and diastolic blood pressure in women (orange) and men (blue).

Mentions: A total of 1006 subjects (476 males) successfully underwent MRI scanning. 40 individuals were excluded due to motion or image artifacts in the scans (34) and failed FreeSurfer processing (6), leaving 966 (450 males) scans for analysis. ICV was significantly larger in the male group (1666.8 ± 122.9 vs. 1453.6 ± 113.5 ml; p < 0.001) (Figure 2). The age range of those included was 50.5–66.8 years, and there was no difference in age between the men and women (58.7 ± 4.1 vs. 58.2 ± 4.3 years; p = 0.056). Furthermore, the men were taller (178.1 ± 6.0 vs. 165.1 ± 5.6 cm; p < 0.001) and had higher DBP (80.0 ± 10.0 vs. 73.2 ± 10.4 mm Hg; p < 0.001) than the women (Figure 3).


Marked effects of intracranial volume correction methods on sex differences in neuroanatomical structures: a HUNT MRI study.

Pintzka CW, Hansen TI, Evensmoen HR, Håberg AK - Front Neurosci (2015)

Histograms showing the distributions of age, height and diastolic blood pressure in women (orange) and men (blue).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4496575&req=5

Figure 3: Histograms showing the distributions of age, height and diastolic blood pressure in women (orange) and men (blue).
Mentions: A total of 1006 subjects (476 males) successfully underwent MRI scanning. 40 individuals were excluded due to motion or image artifacts in the scans (34) and failed FreeSurfer processing (6), leaving 966 (450 males) scans for analysis. ICV was significantly larger in the male group (1666.8 ± 122.9 vs. 1453.6 ± 113.5 ml; p < 0.001) (Figure 2). The age range of those included was 50.5–66.8 years, and there was no difference in age between the men and women (58.7 ± 4.1 vs. 58.2 ± 4.3 years; p = 0.056). Furthermore, the men were taller (178.1 ± 6.0 vs. 165.1 ± 5.6 cm; p < 0.001) and had higher DBP (80.0 ± 10.0 vs. 73.2 ± 10.4 mm Hg; p < 0.001) than the women (Figure 3).

Bottom Line: Sex differences were detected in a few structures; amygdala, cerebellar cortex, and 3rd ventricle were larger in men, but the effect sizes were small.The residuals and ANCOVA methods were most effective at removing the effects of ICV.Adding additional sexual dimorphic covariates to the ANCOVA gave opposite results of those obtained in the ICV-matched subsample or with the residuals method.

View Article: PubMed Central - PubMed

Affiliation: Department of Neuroscience, Norwegian University of Science and Technology Trondheim, Norway ; Department of Medical Imaging, St. Olav's University Hospital Trondheim, Norway.

ABSTRACT
To date, there is no consensus whether sexual dimorphism in the size of neuroanatomical structures exists, or if such differences are caused by choice of intracranial volume (ICV) correction method. When investigating volume differences in neuroanatomical structures, corrections for variation in ICV are used. Commonly applied methods are the ICV-proportions, ICV-residuals and ICV as a covariate of no interest, ANCOVA. However, these different methods give contradictory results with regard to presence of sex differences. Our aims were to investigate presence of sexual dimorphism in 18 neuroanatomical volumes unrelated to ICV-differences by using a large ICV-matched subsample of 304 men and women from the HUNT-MRI general population study, and further to demonstrate in the entire sample of 966 healthy subjects, which of the ICV-correction methods gave results similar to the ICV-matched subsample. In addition, sex-specific subsamples were created to investigate whether differences were an effect of head size or sex. Most sex differences were related to volume scaling with ICV, independent of sex. Sex differences were detected in a few structures; amygdala, cerebellar cortex, and 3rd ventricle were larger in men, but the effect sizes were small. The residuals and ANCOVA methods were most effective at removing the effects of ICV. The proportions method suffered from systematic errors due to lack of proportionality between ICV and neuroanatomical volumes, leading to systematic mis-assignment of structures as either larger or smaller than their actual size. Adding additional sexual dimorphic covariates to the ANCOVA gave opposite results of those obtained in the ICV-matched subsample or with the residuals method. The findings in the current study explain some of the considerable variation in the literature on sexual dimorphisms in neuroanatomical volumes. In conclusion, sex plays a minor role for neuroanatomical volume differences; most differences are related to ICV.

No MeSH data available.


Related in: MedlinePlus