Table 2. Table of included studies showing the characteristics of the studies used in this meta-analysis.

Author	Year of publication	Population of cancer patients	Country	Type of Study	Method of breast cancer assessment	Method of health and dietary assessment	“OR” or “RR” (99% confidence interval)
Fung et al. [8]	2011	3,314	USA	Case-control	Histology	Questionnaire and interview	0.8 (0.64, 1.01)
Kruk, and Marchlewicz [9]	2010	858	Poland	Case-control	Histology	Interview	1.66 (1.0 7, 3.59)
Jones et al. [10]	2014	172	USA	Case-control	MRI	Questionnaire and interview	0.40 (0.3 3, 1.03)
Berkey et al. [11]	2019	9031	USA	Cohort	Histology	Questionnaire	2.27 (1.9 8, 3.87)
Dydjow-Bendek, and Zagoźdźon [12]	2020	201	Poland	Cohort	Histology	Questionnaire and interview	0.40 (0.1 9, 0.85)
Khankari et al. [13]	2016	1506	USA	Case-control	Histology	Questionnaire	0.41 (0.0 6, 0.76)
Link et al. [14]	2013	91,779	USA	Cohort	Histology	Questionnaire	1.29 (1.1 2, 1.49)
Turati et al. [15]	2010	3034	Switzerland and Italy	Case-control	Histology	Questionnaire and interview	0.86 (0.7 6, 0.98)