Table 1:

Relative Risk of breast cancer for women having completed a pregnancy in the past 5 years (dataset 1) versus women not pregnant in the past 5 years

Age of Diagnosis	Approximate relative risk, recently pregnant* versus not**	95% Confidence Interval	#pregnant < 5 years prior / sample size	p-value
20–24	3.33	(1.32,8.38)	9 / 18	.012
25–29	1.76	(1.27,2.46)	93 /149	.00074
30–34	0.87	(0.73,1.05)	201/472	.15
35–39	0.75	(0.63,0.89)	159 / 863	.00092
40–44	0.92	(0.75,1.14)	92 / 1391	.5
45–49	0.73	(0.5,1.08)	26 /1639	.13

^*risk of diagnosis of breast cancer within 5 years of a full-term pregnancy

^**risk of diagnosis of breast cancer in women not having completed a pregnancy in the past 5 years