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Table 3 Proportion (%) of women with mixed/dense mammographic density by hormone use (HT), screening age, period, and birth cohort

From: Mammographic density in birth cohorts of Danish women: a longitudinal study

Never HT users Period 1994–95 (n=26916) Period 1996–97 (n=28065) Period 1998–99 (n=27306) Period 2000–01 (n=27315) Total
Age (years)      
50-51, n=11858 73 (72–73) 74 (74–75) 79 (79–80) 83 (82–85) 77 (77–78)
52-53, n=10006 66 (65–66) 62 (61–63) 72 (71–73) 78 (77–80) 70 (69–71)
54-55, n=8378 60 (59–61) 56 (55–57) 64 (63–65) 73 (71–74) 64 (63–65)
56-57, n=7599 55 (54–56) 52 (51–53) 59 (57–59) 67 (65–69) 58 (58–59)
58-59, n=7298 53 (52–54) 52 (51–53) 56 (55–57) 62 (60–64) 56 (55–57)
60-61, n=7468 50 (49–51) 47 (46–48) 53 (52–54) 60 (58–62) 53 (52–54)
62-63, n=7422 45 (44–46) 45 (44–46) 51 (50–52) 60 (58–62) 50 (49–51)
64-65, n=7556 45 (44–46) 41 (40–42) 50 (49–51) 57 (55–59) 48 (47–49)
66-67, n=7475 45 (44–46) 42 (41–43) 43 (42–44) 55 (53–57) 46 (45–47)
68-69, n=7227 43 (42–44) 41 (40–42) 45 (44–46) 50 (48–52) 44 (43–45)
Total 54 (54–55) 53 (53–54) 59 (59–60) 66 (66–67)  
Current HT users Period 1994– 95 (n=8171) Period 1996– 97 (n=9040) Period 1998– 99 (n=9464) Period 2000– 01 (n=9669) Total
Age (years)      
50-51, n=3649 76 (75–77) 80 (79–81) 83 (82–84) 88 (86–90) 81 (80–83)
52-53, n=4025 76 (75–77) 75 (74–76) 82 (81–83) 84 (82–86) 79 (78–80)
54-55, n=3788 73 (72–75) 73 (72–74) 78 (77–79) 85 (83–87) 78 (77–79)
56-57, n=3462 71 (70–73) 72 (71–73) 76 (75–77) 82 (80–84) 75 (74–77)
58-59, n=2986 72 (71–73) 66 (65–67) 76 (75–78) 81 (79–84) 74 (73–76)
60-61, n=2511 73 (71–74) 70 (69–72) 72 (71–73) 83 (81–86) 75 (73–76)
62-63, n=2047 69 (68–71) 71 (69–72) 75 (74–77) 78 (76–81) 74 (72–75)
64-65, n=1631 68 (66–69) 63 (61–65) 74 (73–76) 80 (77–83) 72 (70–74)
66-67, n=1414 69 (67–71) 69 (68–70) 71 (69–73) 82 (78–85) 73 (71–75)
68-69, n=1162 66 (64–69) 67 (65–69) 72 (70–74) 76 (72–80) 70 (68–73)
Total 73 (72–73) 72 (71–73) 77 (76–78) 83 (82–83)  
  1. Mammography screening program of Funen (1994–2001), Denmark.