Table 1.

Characteristics of 317 women included in final analysis of NAF hormones

Characteristic	Premenopausal					Postmenopausal
	Cases		Controls		P	Cases		Controls		P
	N	Mean (SD) or N (%)	N	Mean (SD) or N (%)		N	Mean (SD) or N (%)	N	Mean (SD) or N (%)
Age	81	45.99 (4.62)	70	45.40 (4.40)	0.43	78	56.27 (5.61)	86	56.83 (5.98)	0.54
Race	81		70		0.64	78		86		0.07
African-American		17 (20.99)		16 (22.86)			17 (21.79)		30 (34.88)
Caucasian		58 (71.60)		46 (65.71)			59 (75.64)		51 (59.30)
Other		6 (7.41)		8 (11.43)			2 (2.56)		5 (5.81)
Menstrual phase	81		70		0.91					NA
Follicular		21 (25.93)		20 (28.57)
Mid-cycle		39 (48.15)		31 (44.29)
Luteal		21 (25.93)		19 (27.14)
Menarche age (years)	81	12.68 (1.40)	70	12.58 (1.27)	0.65	78	12.65 (1.17)	86	12.18 (1.39)	0.02
Parous	81	66 (81.48)	70	46 (65.71)	0.04	78	68 (87.18)	86	68 (79.07)	0.21
Age of first pregnancy (years)	59	27.47 (6.25)	35	27.69 (6.02)	0.87	63	25.76 (7.06)	54	26.22 (6.32)	0.71
Pregnancy number	66	2.74 (1.23)	46	2.59 (1.59)	0.56	68	2.69 (1.41)	68	2.62 (1.40)	0.76
Ever lactated	59	47 (79.66)	35	29 (82.86)	0.79	63	40 (63.49)	54	37 (68.52)	0.70
Duration of lactation (months)	59	12.78 (14.79)	35	13.44 (19.29)	0.85	63	9.66 (14.56)	54	14.32 (18.53)	0.13
Years since last birth	59	14.51 (7.03)	35	13.23 (7.79)	0.42	63	25.89 (10.60)	54	27.56 (8.93)	0.36
BMI (kg/m2)	81	27.26 (6.30)	70	27.46 (6.55)	0.85	78	31.06 (7.16)	86	27.98 (6.13)	<0.01
Any previous breast biopsy	81	32 (39.51)	70	6 (8.57)	<0.01	78	32 (41.03)	86	28 (32.56)	0.33
Positive family history	46	3 (6.52)	25	7 (28.00)	0.03	43	10 (23.26)	35	13 (37.14)	0.22

Two of these 317 women were missing menopausal status. The entire population of NAF yielders is 565. Characteristics of the additional 248 NAF yielders are compared to those of 317 women in Online Resource Table S1