Table II.

PCs of maternal diet and eigenvalues

Components	Eigenvalue	Proportion	Cumulative
PC 1	3.505	0.195	0.195
PC 2	2.813	0.156	0.351
PC 3	1.211	0.067	0.418
PC 4	1.150	0.064	0.482
PC 5	1.081	0.060	0.542

PCs analysis using oblique rotation was used to reduce the maternal diet to fewer variables to reduce multiple testing, summarize correlated dietary variables, and limit the number of covariates included in adjusted analyses of the association of the child diet and microbiome. The top PC was used in regression models. The eigenvalue gives a measure of how much variance in the data is reflected by each principal component. The proportion of variance explained is given for each PC, in addition to the cumulative variance explained.