Seasonal rhythms of menarche in the United States: Correlates to menarcheal age, birth age, and birth month

Matchock, Robert L.; Susman, Elizabeth J.; Brown, F. Martin

doi:10.1016/j.whi.2004.07.007

Cited by 22 publications

(24 citation statements)

References 43 publications

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“…A marked seasonal pattern of menarche has previously been reported such that the monthly occurrence of menarche is not uniformly distributed throughout the year but peaks show up in summer and winter (8,9). Seasonal factors, such as length of daylight, ambient temperatures, and the psychological effects of reduced stress and increased relaxation during school vacation, are some suggested explanations for this seasonal variation (8)(9)(10)(11).…”

Section: Introductionmentioning

confidence: 95%

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Age of Onset, Nutritional Determinants, and Seasonal Variations in Menarche in Rural Bangladesh

Rah

Shamim

Arju

et al. 2010

J Health Popul Nutr

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Menarche is an important milestone in the development of female adolescents. The study assessed the age at menarche using recall, its seasonality, and association with marital and nutritional status (using midupper arm circumference [MUAC]) among 3,923 female adolescents aged 12-19 years in a rural area of Bangladesh. At the time of assessment, most (88%) adolescents had attained menarche at the mean (standard deviation [SD]) age of 12.8 (1.4) years. Age of onset of menarche among married adolescents (13%) occurred earlier than in those who were unmarried (12.6±1.3 years vs 12.9±1.4 years, p<0.01). Age at menarche was negatively associated with MUAC after adjusting for age and marital status (β=-0.10, p<0.01). More than 50% of the adolescents had an onset of menarche during winter (χ 2 =634.97; p<0.001), with peaks in December and January. In this rural population, the current age at menarche was found to be slightly lower than the previous estimates of 13.0 years in Bangladesh. An early onset of menarche was associated with season and better nutritional status of the female adolescents and may be associated with early marriage.

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Section: Introductionmentioning

confidence: 95%

“…Seasonal factors, such as length of daylight, ambient temperatures, and the psychological effects of reduced stress and increased relaxation during school vacation, are some suggested explanations for this seasonal variation (8)(9)(10)(11).…”

Section: Introductionmentioning

confidence: 99%

Age of Onset, Nutritional Determinants, and Seasonal Variations in Menarche in Rural Bangladesh

Rah

Shamim

Arju

et al. 2010

J Health Popul Nutr

View full text Add to dashboard Cite

show abstract

“…Although other critical times of a woman's fertility history, such as menarche or menopause, have a seasonal trend (3,4), no study to date has explored the seasonality of resumption of menses in AN. In this study, we investigated the predictors of weight at resumption of menses in AN, exploring the role of seasonality.…”

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confidence: 99%

Seasonality and the prediction of weight at resumption of menses in anorexia nervosa

Favaro

Santonastaso

2009

Fertility and Sterility

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“…For the question at hand, all these seasonally induced differentials have high explanatory power, particularly due to their potential impact on age at sexual maturation and age at menopause. However, at present, there is little proof that birth month directly affects the timing of menarche (Matchock et al, 2004). Month of birth and month of menarche appear to be largely unrelated, but there is some evidence that mean age at menarche is lower for girls born in November, December, May, June and July, and higher for those born in February, March, August, September and October, which indirectly suggests the existence of some seasonal mechanism (Boldsen, 1992).…”

Section: Discussionmentioning

confidence: 93%

The Impact of Maternal Birth Month on Reproductive Performance: Controlling for Socio-Demographic Confounders

Kemkes¹

2009

J. Biosoc. Sci.

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Based on a 1900 census sample of 34,166 post-reproductive females (> or =45 years), the birth month effect was put to the test, for both lifetime fertility as well as child survival, controlling for maternal birth cohort (1826-1835, 1836-1845, 1846-1855), Duncan's SEI, urbanity, nativity, literacy and marital duration. Testing for potential cohort effects did not indicate a temporal trend in fertility by maternal birth month (seasonal Mann-Kendall test, p=0.578), while a minute increase in offspring survival was detected (p<0.001, Sen's estimator of slope=0.02, 95% CI=0.02 to 0.03). Further analyses of the maternal birth month effect on child survival were therefore seized. For lifetime fertility, ANOVA results indicated that maternal birth month was a major predictor for total offspring count (F11, 33606=1809.0, p<0.001), accounting for 37.2% of the total variability. In addition to main effects, a statistically significant interaction effect was observed (F538, 33606=2.2, p<0.001), with a corresponding effect size of eta2=0.40. Planned contrasts revealed that birth-month-specific differences in fertility achieved statistical significance (F11, 31798=1712.9, p<0.001), while post-hoc multiple comparisons for literacy and nativity displayed an inverse relationship with fertility, which meets demographic expectations. Controlling for all factors of interest, models of cohort-specific offspring counts (independent ANOVAs for 1826-1835: F157, 3467=26.3, p<0.001; 1836-1845: F182, 10299=75.5, p<0.001; 1846-1855: F199, 19859=137.9, p<0.001) indicated that women born in the first half of the year (particularly, January, February, April and May) achieved above-average parity, while those born in the latter half (namely, July, October, November and December) displayed markedly lower fertility averages. These monthly disparities are in line with previous observations and appear to be linked to seasonal optimal ripening of the oocyte or seasonal preovulatory over-ripeness ovopathy (Jongbloet, 1992).

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Seasonal rhythms of menarche in the United States: Correlates to menarcheal age, birth age, and birth month

Cited by 22 publications

References 43 publications

Age of Onset, Nutritional Determinants, and Seasonal Variations in Menarche in Rural Bangladesh

Age of Onset, Nutritional Determinants, and Seasonal Variations in Menarche in Rural Bangladesh

Seasonality and the prediction of weight at resumption of menses in anorexia nervosa

The Impact of Maternal Birth Month on Reproductive Performance: Controlling for Socio-Demographic Confounders

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