Table 4.

Proportion of total variability in the healthy lifestyle score (R²) explained by individual items.

Predictors *	Simple Linear Regression			Stepwise Regression (Cumulative R2)
	Preconception	Pregnancy	Lactation	Total
N	4471	5087	4287	13,845
Healthy Score	R2	R2	R2	R2
Tobacco	0.340	0.254	0.268	0.299
Fresh fruits	0.256	0.274	0.265	0.512
Salads and vegetables	0.175	0.238	0.226	0.614
Buns and pastries	0.157	0.167	0.148	0.694
Activity factor	0.125	0.121	0.098	0.793
Pre-gestational BMI	0.102	0.060	0.076	0.855
Olive oil	0.077	0.071	0.070	0.879
Cereal group	0.054	0.076	0.076	0.947
Illicit drugs	0.068	0.054	0.044	0.964
Sausages	0.036	0.024	0.021	0.977
Protein group	0.026	0.026	0.022	1.00

* All of the predictors of the model were statistical significant in the stepwise regression.