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Table 1 Distribution of age at diagnosis in relation to patient characteristics, tumor characteristics, and surgical treatment

From: Age at diagnosis in relation to survival following breast cancer: a cohort study

Factor Age at diagnosis (years)
  <40 40-49 50-59 60-69 70-79 ≥80
(n = 164) (n = 630) (n = 886) (n = 1062) (n = 818) (n = 559)
  Column percenta
Time of diagnosis       
1961-1970 31 34 29 26 23 20
1971-1980 27 34 39 36 35 32
1981-1991 42 33 32 38 42 48
Menopausal status       
Premenopausal 97 90 21 0 0 0
Postmenopausal 3 10 79 100 100 100
Body Mass Index       
<20 16 11 6 4 5 6
20 - <25 48 43 37 28 26 17
25 - <30 9 16 20 26 26 17
≥30 2 4 8 11 10 5
Missing 25 26 29 31 33 55
Parity (number of children)       
Nullipara 23 20 21 25 28 28
1 26 25 27 25 22 16
2 32 32 31 25 19 12
3 14 15 12 12 13 7
≥4 3 3 5 7 9 10
Unknown 2 5 4 6 9 27
Size of primary tumor (millimeters)       
<5 2 2 4 2 2 1
5 - ≤10 9 12 16 15 10 7
10 - ≤20 30 29 30 34 33 25
20 - ≤50 31 25 23 26 31 33
>50 2 3 3 3 4 6
Missing 26 29 24 20 20 28
Histological type       
Tubular 4 8 8 6 8 4
Tubulo-ductal 9 13 14 18 17 15
Comedo 49 31 28 26 25 23
Lobular 4 10 8 9 9 8
Invasive, variable, unknown 14 12 12 11 11 22
Invasive, type not assessed 20 26 30 30 30 28
Tumor location       
Upper inner quadrant 19 15 18 18 18 16
Lower inner quadrant 7 8 7 7 7 6
Upper outer quadrant 42 43 43 42 41 38
Lower outer quadrant 12 13 11 13 12 11
Central 10 14 14 14 15 18
Missing 10 7 7 6 7 11
Axillary lymph node status       
Negative 51 50 49 55 46 22
Positive 46 44 42 36 34 22
Unknown 3 6 9 9 20 56
Distant metastasis at diagnosis       
No 99 97 95 94 91 90
Yes 1 3 5 6 9 10
Type of surgery       
Mastectomy 85 87 84 81 84 64
Partial mastectomy/local excision 15 13 14 16 9 14
Inoperable 0 0 0 3 7 22
Axillary dissection       
Yes 98 94 92 91 81 44
No 2 6 6 6 12 33
Inoperable 0 0 2 3 7 22
  1. N = number of patients in each age category.
  2. a Due to some missing values, percentages do not always add to 100%.