Table 2 Proportion (%) of women with mixed/dense mammographic density by screening age, period, and birth cohort
From: Mammographic density in birth cohorts of Danish women: a longitudinal study
Copenhagen | Period 1991–93 (n=29991) | Period 1993–95 (n=25920) | Period 1995–97 (n=24981) | Period 1997–99 (n=25269) | Period 1999–2001 (n=24910) | Total |
|---|---|---|---|---|---|---|
Age (years) | ||||||
50-51, n=7818 | 64 (63–65) | 67 (66–68) | 72 (71–73) | 76 (75–77) | 81 (81–82) | 72 (72–73) |
52-53, n=16808 | 56 (55–57) | 62 (61–63) | 68 (67–68) | 73 (72–73) | 80 (79–80) | 68 (68–69) |
54-55, n=14962 | 54 (53–55) | 54 (53–55) | 61 (60–61) | 66 (66–67) | 75 (74–75) | 63 (62–63) |
56-57, n=13546 | 50 (49–50) | 53 (52–54) | 54 (53–55) | 61 (60–62) | 68 (67–69) | 57 (57–58) |
58-59, n=12455 | 48 (47–49) | 50 (49–51) | 52 (51–53) | 54 (53–55) | 63 (62–64) | 54 (53–54) |
60-61, n=12007 | 45 (44–46) | 47 (46–48) | 50 (49–51) | 53 (52–54) | 56 (55–57) | 50 (49–50) |
62-63, n=11758 | 43 (43–44) | 44 (43–45) | 47 (46–48) | 48 (47–49) | 55 (52–54) | 47 (46–47) |
64-65, n=11627 | 43 (42–44) | 42 (41–43) | 43 (42–44) | 47 (46–48) | 51 (50–52) | 45 (44–45) |
66-67, n=11886 | 42 (41–42) | 42 (41–43) | 43 (42–44) | 46 (45–47) | 49 (48–50) | 44 (43–44) |
68-69, n=12009 | 42 (41–43) | 42 (41–43) | 43 (42–44) | 43 (42–44) | 48 (47–49) | 43 (43–44) |
70-71, n=6194 | 41 (40–42) | 42 (41–43) | 43 (41–44) | 45 (44–47) | 46 (44–47) | 43 (42–44) |
Total | 47 (47–48) | 49 (49–50) | 53 (53–54) | 58 (57–58) | 64 (64–64) | |
Funen 1 | Period 1994– 95 (n=39059) | Period 1996– 97 (n=42767) | Period 1998– 99 (n=43564) | Period 2000– 01 (n=45275) | Total | |
Age (years) | ||||||
50-51, n=23122 | 73 (72–74) | 75 (74–76) | 80 (79–81) | 84 (83–85) | 78 (77–78) | |
52-53, n=22277 | 68 (67–70) | 65 (64–66) | 74 (73–75) | 79 (78–80) | 72 (71–73) | |
54-55, n=20506 | 64 (63–66) | 61 (60–63) | 68 (66–69) | 76 (74–77) | 68 (67–68) | |
56-57, n=18539 | 60 (59–62) | 58 (56–59) | 64 (62–65) | 71 (69–72) | 64 (63–64) | |
58-59, n=16776 | 58 (56–59) | 56 (54–47) | 62 (61–64) | 68 (67–69) | 61 (60–62) | |
60-61, n=15664 | 55 (53–56) | 53 (52–55) | 59 (57–60) | 67 (65–68) | 59 (58–59) | |
62-63, n=14734 | 50 (49–52) | 50 (49–52) | 57 (55–59) | 64 (63–66) | 56 (55–57) | |
64-65, n=13820 | 49 (47–51) | 45 (44–47) | 54 (53–56) | 62 (60–64) | 53 (52–54) | |
66-67, n=13065 | 49 (47–51) | 47 (45–49) | 49 (47–51) | 60 (58–62) | 51 (50–52) | |
68-69, n=12162 | 46 (45–48) | 45 (44–47) | 50 (48–52) | 55 (53–57) | 49 (48–50) | |
Total | 59 (58–59) | 58 (57–58) | 64 (63–64) | 70 (70–71) |