Table 2.

Multivariate analysis of factors associated with BMI status. ^a

Characteristics	Overweight (N = 551)		Obese (N = 186)		P value
	OR	95% CI	OR	95% CI
Age, years					0.005
<50 vs >65	0.43	0.26-0.74	0.33	0.14-0.76
50-65 vs >65	0.91	0.69-1.19	0.80	0.55-1.16
Menstruation status					0.413
pre- vs post-	0.91	0.58-1.42	0.63	0.31-1.28
Grade					0.030
I vs III	0.48	0.30-0.78	0.90	0.48-1.67
II vs III	0.91	0.69-1.20	0.96	0.62-1.47
Tumor size, cm					0.009
≤2.0 vs >2.0	0.68	0.54-0.87	0.87	0.60-1.26
ALN status					0.529
Negative vs Positive	0.88	0.66-1.18	1.12	0.72-1.76
PR status					0.041
Negative vs Positive	0.68	0.47-0.98	0.59	0.33-1.084
RS category b					0.033
Low vs High	1.05	0.65-1.70	2.45	1.38-4.35
Intermediate vs High	1.13	0.89-1.43	1.40	0.97-2.03

^aThe reference category for subtype characteristics is BMI < 24 kg/m² (N = 1,139).

^bThe cutoff for RS category was <11, 11–25, >25.

BMI, body mass index; OR, odds ratio; CI, confidence interval; ALN, axillary lymph node; PR, progesterone receptor; RS, recurrence score.

Bold values mean statistically significant.