Pregnancy weight gain and breast cancer risk

BMC Women's Health

Table 3 Breast cancer incidence (per 100,000 person years, py) by estimated total weight gain (weeks 0–40).

Weight gain (kg)	Breast cancer cases (n)	Number of women	Py 171	Incidence 0
<0	0	4
0–4.99	1	42	1,677	60
5–9.99	23	423	16,614	138
10–14.99	53	954	37,266	142¹
15–19.99	33	508	19,498	169
≥20	13	158	6,086	213
total	123	2,089	81,312	151

¹ Breast cancer incidence was exceptionally high (200 per 100,000) in mothers who gained 10–10.99 kg during pregnancy.

ISSN: 1472-6874