Table 1.

Sociodemographic and clinical characteristics of the study groups (A1 vs. A2) and between-group differences

Demographic data	A1 (n = 167)			A2 (n = 117)
Age, mean year (SD)	63.67 (8.41)				63.41 (7.38)
Student t-test/Mann-Whitney U-test			t = 0.26, p = 0.7955
Number of family members (SD)	2.17 (1.04)				2.56 (2.21)
Student t-test/Mann-Whitney U-test			Z = 1.22, p = 0.2212
	Number		%		Number	%
Education	elementary	5	3.11		8	6.84
	middle	116	72.05		71	60.68
	high	40	24.84		38	32.48
	χ²			4.73
	degrees of freedom			2
	p-value			0.0941
Residency	village	29	18.01		27	23.08
	town up to 100,000	57	35.40		44	37.61
	town > 100,000	75	46.58		46	39.32
	χ²			1.78
	degrees of freedom			2
	p-value			0.4116
Occupation	full-time	19	11.80		27	23.08
	farming	4	2.48		1	0.85
	retirement	114	85.72		62	76.07
	χ²			12.07
	degrees of freedom			3
	p-value			0.0071
Adjuvant therapy, n (%)	CHTH, RTH	73	59.8		70	45.3
	χ²			5.69
	degrees of freedom			1
	p-value			0.01
	CHTH	37	22.9		22	18.0
	χ²			0.707
	degrees of freedom			1
	p-value			0.40
	RTH	29	18		11	9.4
	χ²			4.07
	degrees of freedom			1
	p-value			0.04
	HTH	83	51.5		59	50.42
	χ²			0.03
	degrees of freedom			1
	p-value			0.85

A1 – members of Amazon groups; A2 – control group; p – statistical significance; CHTH – chemotherapy; RTH – radiotherapy; HTH – hormone therapy