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. 2022 Apr 1;22:268. doi: 10.1186/s12877-022-02936-5

Table 3.

Baseline characteristics of patients with chemotherapy and no-chemotherapy in PSM group

Characteristics No- Chemotherapy (n = 1330) Chemotherapy (n = 1330) Total (n = 2660) Pc
No % No % No %
Median follow-up (months) (IQR) 25(9–49) 26(11–48) 26(10–48.75)
Age (years) 70–79 1046 78.6 1055 79.3 2101 79.0 0.703
80 +  284 21.4 275 20.7 559 21.0
Race White 982 73.8 982 73.8 1964 73.8 1.000
Black 248 18.7 248 18.7 496 18.7
Othera 100 7.5 100 7.5 200 7.5
Marital status Married 608 45.7 632 47.5 1240 46.6 0.371
Not marriedb 722 54.3 698 52.5 1420 53.4
Grade I and II 259 19.5 287 21.6 546 20.5 0.195
III 1071 80.5 1043 78.4 2114 79.5
AJCC stage I 647 48.6 665 50.0 1312 49.3 0.645
II 494 37.1 491 36.9 985 37.0
III 189 7.1 174 13.1 363 13.6
Tumor status T1 727 54.7 723 54.4 1450 54.5 0.258
T2 453 34.1 436 32.8 889 33.4
T3 83 6.2 80 6.0 163 6.1
T4 67 5.0 91 6.8 158 5.9
Nodal status N0 990 74.4 1030 77.4 2020 75.9 0.146
N1 218 16.4 197 14.8 415 15.6
N2 67 5.0 66 4.9 133 5.0
N3 55 4.1 37 2.9 92 3.5
Surgery approach No surgery 70 5.3 67 5.0 137 5.2 0.861
Mastectomy and BCS 1260 94.7 1263 95.0 2523 94.8
Radiation Yes 610 45.9 638 48.0 1248 46.9 0.294
No 720 54.1 692 52.0 1412 53.1

Abbreviation: AJCC American Joint Committee on Cancer; BCS, breast-conserving surgery, IQR Interquartile range

aOther includes American Indian/Alaskan native and Asian/Pacific Islander and Unknown

bNot married includes divorced, separated, single (never married), unmarried or domestic partner, and widowed

cThe P value of the Chi-square test was calculated between the chemotherapy and no-chemotherapy groups, and bold type indicates significance