Table 1 Description of covariate and code in the study

Socio-demographic factors:

Age at diagnosis

1 < = 40,

2 > 40

Education level

Resident

1 = primary,2 = secondary ,3 = degree and above

0 = urban, 1 = rural

Marital status

1 = single, 2 = married

3 = widowed, 4 = divorced

Clinic-pathological factors

Pre-existing comorbidity

1 = yes, 2 = no

BMI at diagnosis

1 = Normal, 2 = overweight

Stage of cancer

1 = I, 2 = II, 3 = III

Histologic grade

1 = grade I, 2 = grade II, 3 = grade III

Surgical margin

1 = free, 2 = involved

Axillary Node status

1 = negative ,2 = positive

Number of Positive Lymph nodes involved

0 = < 2 ,

1 = >= 2

Tumor size

0 = < 2 cm, 1 = 2.5–5 cm, 2 = > 5 cm

Estrogen receptor

1 = negative, 2 = positive ,3 = not determined

Progesterone receptor

1 = positive, 2 = negative

Treatment-related factors

Baseline treatment

0 = Surgery, 1 = Chemotherapy,

2 = Chemotherapy & Surgery

Duration from date of diagnosis to surgery

1 = < 30 days, 2 = >= 30 days

Adjuvant chemotherapy use

1 = yes, 2 = no

Type of chemotherapy regimen

1 = AC, 2 = Paclitaxel, 3 = Combination

Hormone therapy use

0 = yes, 1 = no

Type of hormone used

1 = Tamoxifen, 2 = Anastrozole