Table 1 Characteristics of the Stockholm and Singapore breast cancer cohorts

Period of diagnosis

1980 to 1999

1980 to 1999

Number of breast cancer cases

17,090

10,287

   1980 to 1989 (%)

7,932 (46)

3,135 (30)

   1990 to 1999 (%)

9,148 (53)

7,152 (70)

Median age at diagnosis (years)

62

50

   Standard deviation

14

13

   Range (years)

18 to 101

12 to 98

   Diagnosed ≤ 50 years old (%)

4,247 (25)

5,360 (52)

   Diagnosed >50 years (%)

12,843 (75)

4,927 (48)

Number of women with information on disease stage^a (%)

16,869 (99)

6,569 (64)

   1980 to 1989

Local cancer (%)

6,047 (77)

1,090 (48)

Regional cancer (%)

1,667 (21)

961 (43)

Distant cancer (%)

165 (2)

196 (9)

   1990 to 1999

Local cancer (%)

7,387 (82)

2,283 (53)

Regional cancer (%)

1,358 (15)

1,692 (39)

Distant cancer (%)

245 (3)

347 (8)

Estrogen receptor status

   Positive

9,874 (77)

Not available

   Negative

2,984 (33)

Not available

Number of deaths (%)

9,330 (55)

4,782 (46)

Number of breast cancer deaths (%)

4,050 (24)

2,684 (26)