Table 1.

Background parenchymal enhancement (mean ± standard deviation, %) in the group women < 55 y/o and ≥55 y/o

		Baseline MRI	F/U-1 MRI	F/U-2 MRI
< 55 y/o	Entire DCE period	20.1±7.4	18.8±6.9	13.3±5.7 *†
	Early (1~3 min)	12.1±9.5	11.4±10.5	7.1±5.6 *†
	Middle (3~5 min)	22.0±14.9	20.5±15.8	14.6±10.1 *†
	Late (5~7 min)	26.2±15.9	24.7±16.5	18.1±11.4 *†
≥55 y/o	Entire DCE period	12.1±5.1	11.0 ±3.8	11.8±4.8
	Early (1~3 min)	6.5±4.3	7.0±5.4	6.6±4.0
	Middle (3~5 min)	13.8±7.1	11.5±6.8	13.9±9.7
	Late (5~7 min)	16.1±8.9	14.5±7.9	14.8±8.3

^*significantly lower compared to the Baseline value

^†significantly lower compared to the F/U-1 value