Table 3.

Baseline Characteristics of LACE Study Participants (N = 1,901) by Quartiles of the Western Dietary Pattern

Characteristic	Quartiles of Western Dietary Pattern								P*
	Q1 (n = 475)		Q2 (n = 475)		Q3 (n = 475)		Q4 (n = 476)
	No. of Participants	%	No. of Participants	%	No. of Participants	%	No. of Participants	%
Age at diagnosis, years†									.008
Mean	59.3		58.9		58.9		57.1
Standard deviation	10.3		10.6		11.1		11.1
Race									.005
White	378	80	392	82	397	84	392	83
Black	20	4	17	4	18	4	20	4
Hispanic	15	3	24	5	31	6	31	6
Asian/Pacific Islander	45	9	27	6	17	4	17	4
Other	17	4	15	3	12	2	14	3
BMI at enrollment, kg/m2†									< .0001
Mean	25.6		27.2		27.7		29.1
Standard deviation	4.7		5.5		5.8		6.4
Positive family history of breast cancer	95	20	94	20	102	21	92	19	.87
Menopausal status at diagnosis									.04
Postmenopausal	319	67	325	68	309	65	282	59
Premenopausal	88	18	100	21	99	21	119	25
Unknown	68	14	50	11	67	14	73	15
Physical activity, MET-h/wk of total activity‡									.52
Median	47.4		48.3		44.4		46.8
Range	0-307		1-192		0-237		0-259
Weight change from before diagnosis to enrollment, lb†									.0002
Mean	1.2		3.6		3.6		6.1
Standard deviation	14.7		15.7		15.7		18.9
Ever smoker	197	41.5	226	47.7	232	48.8	237	50.0	.04
Stage									.45
I ≥ 1 cm	233	49	216	45	240	50	221	47
IIA	156	33	167	35	134	28	163	34
IIB	68	14	80	17	87	18	75	16
IIIA	16	3	12	3	14	3	15	3
Hormone receptor status									.14
ER negative/PR negative	70	15	72	15	70	15	79	17
ER negative/PR positive	6	1	11	2	12	2	6	1
ER positive/PR negative	78	17	50	11	69	15	77	17
ER positive/PR positive	315	67	339	72	320	68	305	65
Surgery type									.97
Breast-conserving surgery	237	50	238	50	244	51	242	51
Mastectomy	238	50	237	50	231	49	234	49
Tamoxifen use	373	78	359	76	381	80	366	77	.35
Treatment									.83
None	89	19	75	16	83	17	88	18
Chemotherapy only	85	18	103	22	84	18	93	20
Radiation only	123	26	124	26	132	28	117	25
Both	176	37	173	36	174	37	178	37
Positive nodes	147	33	169	38	157	35	162	37	.51
Tumor size ≥ 2 cm	215	46	222	47	217	46	203	44	.80

Abbreviations: LACE, Life After Cancer Epidemiology; BMI, body mass index; MET, metabolic equivalent; ER, estrogen receptor; PR, progesterone receptor.

^*Pearson χ² test, unless otherwise specified.

^†Analysis of variance.

^‡Kruskal-Wallis test.