Table 3.

Analyses of the treatment modalities according to the education level and clinicopathologic characteristics in the subgroup aged > 50 years

Characteristic (age > 50 yr)	Operation			Radiation therapy			Chemotherapy			Endocrine therapy
	Lumpectomymastectomy		Chi-square p-value	No	Yes	Chi-square p-value	No	Yes	Chi-square p-value	No	Yes	Chi-square p-value
All
Low education level	6,814 (47.8)	7,437 (52.2)	< 0.001	5,317 (43.5)	6,915 (56.5)	< 0.001	4,018 (31.7)	8,661 (68.3)	0.029	3,955 (44.9)	4,859 (55.1)	< 0.001
High education level	7,055 (59.2)	4,863 (40.8)		3,571 (33.8)	6,994 (66.2)		3,610 (33.0)	7,321 (67.0)		3,354 (40.1)	5,017 (59.9)
Tumor size ≤ 2 cm
Low education level	4,659 (61.2)	2,957 (38.8)	< 0.001	2,503 (38.2)	4,050 (61.8)	< 0.001	2,867 (42.9)	3,811 (57.1)	0.083	1,887 (38.5)	3,014 (61.5)	< 0.001
High education level	5,077 (69.5)	2,230 (30.5)		1,932 (29.7)	4,574 (70.3)		2,954 (44.4)	3,696 (55.6)		1,833 (34.7)	3,448 (65.3)
Tumor size > 2 cm
Low education level	2,027 (31.7)	4,376 (68.3)	< 0.001	2,741 (50.0)	2,742 (50.0)	< 0.001	1,075 (18.6)	4,719 (81.4)	< 0.001	1,943 (52.0)	1,791 (48.0)	< 0.001
High education level	1,804 (41.6)	2,532 (58.4)		1,545 (40.5)	2,274 (59.5)		523 (13.0)	3,509 (87.0)		1,371 (47.6)	1,510 (52.4)
Node negative
Low education level	4,881 (55.1)	3,971 (44.9)	< 0.001	3,467 (45.6)	4,129 (54.4)	< 0.001	3,339 (43.0)	4,426 (57.0)	0.042	2,485 (45.8)	2,945 (54.2)	< 0.001
High education level	5,267 (66.1)	2,698 (33.9)		2,445 (34.5)	4,649 (65.5)		3,235 (44.6)	4,011 (55.4)		2,282 (40.6)	3,334 (59.4)
Node positive
Low education level	1,857 (35.3)	3,403 (64.7)	< 0.001	1,792 (39.5)	2,746 (60.5)	< 0.001	614 (12.8)	4,197 (87.2)	< 0.001	1,435 (43.2)	1,885 (56.8)	< 0.001
High education level	1,714 (44.8)	2,114 (55.2)		1,089 (32.1)	2,301 (67.9)		323 (9.0)	3,275 (91.0)		1,038 (38.6)	1,649 (61.4)
Stage I
Low education level	3,683 (63.7)	2,103 (36.3)	< 0.001	1,946 (39.0)	3,041 (61.0)	< 0.001	2,630 (52.2)	2,406 (47.8)	0.066	1,466 (39.3)	2,262 (60.7)	< 0.001
High education level	4,153 (72.0)	1,613 (28.0)		1,518 (29.4)	3,637 (70.6)		2,818 (54.0)	2,397 (46.0)		1,450 (34.5)	2,754 (65.5)
Stage II, III
Low education level	2,940 (36.2)	5,172 (63.8)	< 0.001	3,267 (46.8)	3,711 (53.2)	< 0.001	1,273 (17.3)	6,087 (82.7)	< 0.001	2,368 (48.7)	2,490 (51.3)	< 0.001
High education level	2,685 (46.3)	3,116 (53.7)		1,944 (37.8)	3,196 (62.2)		644 (11.9)	4,770 (88.1)		1,753 (44.5)	2,183 (55.5)
Hormonal receptor negative
Low education level	1,817 (41.1)	2,607 (58.9)	< 0.001	1,832 (45.9)	2,161 (54.1)	< 0.001	660 (15.8)	3,526 (84.2)	0.828	NA	NA
High education level	1,787 (52.1)	1,644 (47.9)		1,172 (37.3)	1,973 (62.7)		510 (15.6)	2,763 (84.4)		NA	NA
Hormonal receptor positive
Low education level	4,413 (51.7)	4,119 (48.3)	< 0.001	3,172 (41.2)	4,520 (58.8)	< 0.001	3,139 (39.7)	4,760 (60.3)	0.208	493 (10.2)	4,334 (89.8)	0.015
High education level	4,773 (62.5)	2,864 (37.5)		2,207 (31.5)	4,801 (68.5)		2,943 (40.7)	4,280 (59.3)		445 (8.8)	4,620 (91.2)
Lumpectomy
Low education level	NA	NA		529 (9.0)	5,353 (91.0)	< 0.001	2,117 (35.7)	3,815 (64.3)	0.007	1,680 (30.2)	3,879 (69.8)	0.418
High education level	NA	NA		433 (6.9)	5,803 (93.1)		2,415 (38.0)	3,937 (62.0)		1,776 (29.5)	4,238 (70.5)
Mastectomy
Low education level	NA	NA		4,737 (76.4)	1,462 (23.6)	0.001	1,829 (27.8)	4,756 (72.2)	0.025	2,220 (70.8)	914 (29.2)	0.032
High education level	NA	NA		3,092 (73.6)	1,109 (26.4)		1,147 (25.8)	3,291 (74.2)		1,532 (68.1)	717 (31.9)

NA, not applicable.