Sample size estimates for well-powered cross-sectional cortical thickness studies.

Abstract:

INTRODUCTION:Cortical thickness mapping is a widely used method for the analysis of neuroanatomical differences between subject groups. We applied power analysis methods over a range of image processing parameters to derive a model that allows researchers to calculate the number of subjects required to ensure a well-powered cross-sectional cortical thickness study. METHODS:0.9-mm isotropic T1 -weighted 3D MPRAGE MRI scans from 98 controls (53 females, age 29.1 ± 9.7 years) were processed using Freesurfer 5.0. Power analyses were carried out using vertex-wise variance estimates from the coregistered cortical thickness maps, systematically varying processing parameters. A genetic programming approach was used to derive a model describing the relationship between sample size and processing parameters. The model was validated on four Alzheimer's Disease Neuroimaging Initiative control datasets (mean 126.5 subjects/site, age 76.6 ± 5.0 years). RESULTS:Approximately 50 subjects per group are required to detect a 0.25-mm thickness difference; less than 10 subjects per group are required for differences of 1 mm (two-sided test, 10 mm smoothing, α = 0.05). Sample size estimates were heterogeneous over the cortical surface. The model yielded sample size predictions within 2-6% of that determined experimentally using independent data from four other datasets. Fitting parameters of the model to data from each site reduced the estimation error to less than 2%. CONCLUSIONS:The derived model provides a simple tool for researchers to calculate how many subjects should be included in a well-powered cortical thickness analysis.

journal_name

Hum Brain Mapp

journal_title

Human brain mapping

authors

Pardoe HR,Abbott DF,Jackson GD,Alzheimer's Disease Neuroimaging Initiative.

doi

10.1002/hbm.22120

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

3000-9

issue

11

eissn

1065-9471

issn

1097-0193

journal_volume

34

pub_type

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