A comparative analysis of estimation of age at menarche by various methods in women participating in the Krakow Longitudinal Growth Study, Poland

Żarów, Ryszard; Cichocka, Barbara Anna

doi:10.1002/ajhb.20701

Cited by 16 publications

(11 citation statements)

References 10 publications

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“…Furthermore, some studies report that recall diminishes with age, while others report no age effect [87]. Recall of menarcheal age may also be faulty for women, although one study showed that it was equally likely to be overestimated by 1 year as underestimated by 1 year [88].…”

Section: Discussionmentioning

confidence: 99%

Milk Intake and Total Dairy Consumption: Associations with Early Menarche in NHANES 1999-2004

Wiley

2011

PLoS ONE

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BackgroundSeveral components of dairy products have been linked to earlier menarche.Methods/FindingsThis study assessed whether positive associations exist between childhood milk consumption and age at menarche or the likelihood of early menarche (<12 yrs) in a U.S sample. Data derive from the National Health and Nutrition Examination Survey (NHANES) 1999–2004. Two samples were utilized: 2657 women age 20–49 yrs and 1008 girls age 9–12 yrs. In regression analysis, a weak negative relationship was found between frequency of milk consumption at 5–12 yrs and age at menarche (daily milk intake β = −0.32, P<0.10; “sometimes/variable milk intake” β = −0.38, P<0.06, each compared to intake rarely/never). Cox regression yielded no greater risk of early menarche among those who drank milk “sometimes/varied” or daily vs. never/rarely (HR: 1.20, P<0.42, HR: 1.25, P<0.23, respectively). Among the 9–12 yr olds, Cox regression indicated that neither total dairy kcal, calcium and protein, nor daily milk intake in the past 30 days contributed to early menarche. Girls in the middle tertile of milk intake had a marginally lower risk of early menarche than those in the highest tertile (HR: 0.6, P<0.06). Those in the lowest tertiles of dairy fat intake had a greater risk of early menarche than those in the highest (HR: 1.5, P<0.05, HR: 1.6, P<0.07, lowest and middle tertile, respectively), while those with the lowest calcium intake had a lower risk of early menarche (HR: 0.6, P<0.05) than those in the highest tertile. These relationships remained after adjusting for overweight or overweight and height percentile; both increased the risk of earlier menarche. Blacks were more likely than Whites to reach menarche early (HR: 1.7, P<0.03), but not after controlling for overweight.ConclusionsThere is some evidence that greater milk intake is associated with an increased risk of early menarche, or a lower age at menarche.

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Section: Discussionmentioning

confidence: 99%

Milk Intake and Total Dairy Consumption: Associations with Early Menarche in NHANES 1999-2004

Wiley

2011

PLoS ONE

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“…To calculate the average age of the onset of menstruation, probity models were fitted to the proportion of girls at each age who had reached menarche. This approach, sometimes referred to as the status quo method, is mainly used in cross sectional studies of children and adolescents [21–23]. The status quo method is employed to estimate the mean age at menarche by studying all data concerning girls from the analysed group, whereas the retrospective method can only be used for girls who have already reached menarche [21].…”

Section: Methodsmentioning

confidence: 99%

“…This approach, sometimes referred to as the status quo method, is mainly used in cross sectional studies of children and adolescents [21–23]. The status quo method is employed to estimate the mean age at menarche by studying all data concerning girls from the analysed group, whereas the retrospective method can only be used for girls who have already reached menarche [21]. The calculation was carried out as follows: ages were recorded and calculated as decimals (e.g., 8.00–8.99 years, 9.00–9.99 years).…”

Section: Methodsmentioning

confidence: 99%

Correlation of body mass index levels with menarche in adolescent girls in Shaanxi, China: a cross sectional study

et al. 2016

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BackgroundMenarche is a milestone for adolescent girls. The timing of menarche is influenced by genetics, social status and nutritional status (e.g., height, weight and body mass index [BMI]) and impacts future health (e.g., obesity and breast cancer). There have been many studies on trends in age at menarche among adolescent girls in China, but few have investigated associations between growth status and the timing of menarche. This study examined the association between age at menarche and growth status among adolescent girls in Western China.MethodsThe participants in this cross sectional study came from three geographical regions of Shaanxi Province. A total of 533 adolescent girls from urban and rural areas were randomly selected. Trained investigators administered a standard questionnaire to each participant during a face-to-face interview and carried out anthropometric measurements.ResultsThe average age at menarche was 13.3 years. There were statistically significant differences in BMI z-scores between pre-menarcheal and post-menarcheal girls of the same age and these differences were related to socioeconomic factors. Girls who had reached menarche, in particular those aged 13–14 years, were significantly taller (P < 0.01) and had higher BMI (P < 0.01) than girls in the same age group who had not reached menarche.ConclusionsBMI is associated with the timing of menarche but socioeconomic factors are also important.

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“…The available literature also prevented us from analyzing studies separately according to different methods of measuring mean AAM. While we included studies based both on probit methods and on retrospective recollection, previous studies reported contradictory results depending on the methodology [63,64]. Data for AAM in different ethnic groups was only available for early studies [49,61] and was, therefore, not included in the current analysis.…”

Section: Discussionmentioning

confidence: 99%

Long-Term Secular Trends in the Age at Menarche in Israel: A Systematic Literature Review and Pooled Analysis

Flash-Luzzatti

Weil²,

Shalev³

et al. 2014

Horm Res Paediatr

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Background/Aims: A worldwide decline in the age at menarche (AAM) has been reported in recent decades. This trend has been also clinically observed among Israeli women and was reported in our previous study. Methods: We reviewed the literature reporting the mean AAM in Israel during the past century. Studies were excluded if participants had been investigated due to illness or any condition which could affect sexual maturation. Mean AAM was analyzed using a simple linear regression weighted for number of participants in each birth cohort and stratified to birth cohorts before and after 1970, based on the outcome of our previous study. Results: AAM varied little among women born between 1875 and 1970, but there was a clear downwards trend from 13.4 in 1970 to 12.8 two decades later. In a stratified analysis we found a significant negative association between birth year and AAM in the birth cohort after 1970 (standardized β coefficient = -0.94 per year, R² = 0.87; p < 0.001). Conclusion: These results suggest a significant decline in mean AAM in Israeli women born in 1970 or later.

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A comparative analysis of estimation of age at menarche by various methods in women participating in the Krakow Longitudinal Growth Study, Poland

Cited by 16 publications

References 10 publications

Milk Intake and Total Dairy Consumption: Associations with Early Menarche in NHANES 1999-2004

Milk Intake and Total Dairy Consumption: Associations with Early Menarche in NHANES 1999-2004

Correlation of body mass index levels with menarche in adolescent girls in Shaanxi, China: a cross sectional study

Long-Term Secular Trends in the Age at Menarche in Israel: A Systematic Literature Review and Pooled Analysis

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