Work

Determinants of age at menarche in the UK: analyses from the Breakthrough Generations Study

Year: 2010

Type: article

Abstract: BACKGROUND: Early menarche increases breast cancer risk but, aside from weight, information on its determinants is limited. METHODS: Age at menarche data were collected retrospectively by questionnaire from 81,606 women aged 16-98, resident in the UK and participating in the Breakthrough Generations Study. RESULTS: Menarche occurred earlier in women who had a low birthweight (P(trend)<0.001), were singletons (P<0.001), had prenatal exposure to pre-eclampsia (P<0.001) or maternal smoking (P=0.01), were not breastfed (P(trend)=0.03), were non-white (P<0.001), were heavy (P(trend)<0.001) or tall (P(trend)<0.001) compared with their peers at age 7 and exercised little as a child (P(trend)<0.001). Menarcheal age increased with number of siblings (P<0.001) independently of birth order, and had an inverse association with birth order after adjustment for sibship size (P<0.001). In a multivariate model, birthweight, ethnicity, weight, height, exercise, sibship size and birth order remained significant, and maternal age at birth became significant (positive association, P<0.001). CONCLUSION: Age at menarche was influenced by both pre- and post-natal factors, and these factors may affect breast cancer risk through this route.

Source: British Journal of Cancer

DOI: 10.1038/sj.bjc.6605978

Authors: D H Morris, M E Jones, M J Schoemaker, A Ashworth, A J Swerdlow

Institution: Institute of Cancer Research

Language: English

Topic: Cancer Risks and Factors

Subfield: Oncology

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: hybrid

Estimated APC paid: $5,190