Table 5.

Stepwise multiple regression analysis for parameters associated with vitamin D₃ or 25OHD₃ concentration in breast milk.

Parameters	Vitamin D3 Concentration			25OHD3 Concentration
	β	R2	P	β	R2	P
Season [Winter-Summer]	−0.050	0.107	0.002	−0.060	0.196	<0.001
Daily outdoor activity time (min)	6.0 × 10−4	0.059	0.015	1.5 × 104	0.006	0.410
Suntan in last 12 months [Yes-No]	−0.042	0.040	0.040	−0.018	0.013	0.232