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Age at Menarche by Birth Cohort: A Pooled Analysis of Half a Million Women in Asia Publisher Pubmed



Abe SK1 ; Nishio M1 ; Huang HL1 ; Leung CY1 ; Islam MR1, 2 ; Rahman MS1, 3 ; Saito E4 ; Shin A5, 6 ; Merritt MA7 ; Choi JY6, 8 ; Katagiri R9 ; Mohammadi Z10 ; Shu XO11 ; Wakai K12 Show All Authors
Authors
  1. Abe SK1
  2. Nishio M1
  3. Huang HL1
  4. Leung CY1
  5. Islam MR1, 2
  6. Rahman MS1, 3
  7. Saito E4
  8. Shin A5, 6
  9. Merritt MA7
  10. Choi JY6, 8
  11. Katagiri R9
  12. Mohammadi Z10
  13. Shu XO11
  14. Wakai K12
  15. Sawada N13
  16. Ideno Y14
  17. Tamakoshi A15
  18. Seow WJ16
  19. Koh WP17, 18
  20. Sakata R19
  21. Hozawa A20
  22. Kim J21
  23. Nagata C22
  24. Sugawara Y20
  25. Park SK5
  26. Kweon SS23
  27. Azizi F24
  28. Malekzadeh R25
  29. Moy FM26
  30. Pourfarzi F27
  31. Gao YT28, 29
  32. Kubo Y12
  33. Hirabayashi M1
  34. Nagai K14
  35. Kimura T15
  36. Yuan JM30, 31
  37. Kanemura S20
  38. Wada K22
  39. Kang D5, 6
  40. Shin MH23
  41. Khalili D32
  42. Poustchi H10
  43. Rezaianzadeh A33
  44. Mansourghanaei F34
  45. Najafi F35
  46. Mohebbi I36
  47. Boffetta P37, 38
  48. Lee JE39
  49. Matsuo K40
  50. Rothman N41
  51. Qiao YL42
  52. Zheng W11
  53. Inoue M1

Source: Public Health Published:2024


Abstract

Objectives: To evaluate changes in the age at menarche in Asian populations. Study design: Retrospective cohort study. Methods: We included 548,830 women from six countries in Asia. The data were sourced from 20 cohorts participating in the Asia Cohort Consortium (ACC) and two additional cohort studies: Japan Multi-institutional Collaborative Cohorts (J-MICC), and Japan Nurse Health Study (JNHS) with data on age at menarche. Joinpoint regression was used to evaluate changes in age at menarche by birth year and by country. Results: The study includes data from cohorts in six Asian countries namely, China, Iran, Japan, Korea, Malaysia and Singapore. Birth cohorts ranged from 1873 to 1995. The mean age of menarche was 14.0 years with a standard deviation (SD) of 1.4 years, ranged from 12.6 to 15.5 years. Over 100 years age at menarche showed an overall decrease in all six countries. China showed a mixed pattern of decrease, increase, and subsequent decrease from 1926 to 1960. Iran and Malaysia experienced a sharp decline between about 1985 and 1990, with APC values of −4.48 and −1.24, respectively, while Japan, South Korea, and Singapore exhibited a nearly linear decline since the 1980s, notably with an APC of −3.41 in Singapore from 1993 to 1995. Conclusions: Overall, we observed a declining age at menarche, while the pace of the change differed by country. Additional long-term observation is needed to examine the contributing factors of differences in trend across Asian countries. The study could serve as a tool to strengthen global health campaigns. © 2024 The Royal Society for Public Health
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