Tendência secular de 10 e 20 anos da maturação sexual de escolares

Farias, Rodrigo Mateus; Matsudo, Sandra Marcela Mahecha; Ferrari, Gerson Luis Moraes; Matsudo, Victor Keihan Rodrigues

doi:10.5007/1980-0037.2012v14n6p680

Cited by 4 publications

(5 citation statements)

References 21 publications

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“…9 In Brazil, data on the subject are scarce and controversial. [10][11][12] The characterization of puberty in boys in epidemiological studies is more complex than in girls, considering it relies on two main methods: one based on pictures, presented by Marshall and Tanner, 7 and another, more precise, based on measurements that can be taken with an orchidometer. [13][14][15]9 Therefore, it is difficult to make an accurate comparison between studies.…”

Section: Introductionmentioning

confidence: 99%

Puberty in a Sample of Brazilian Schoolboys: Onset and Anthropometric Characteristics

Feibelmann

Silva

Santos

et al. 2021

Rev. paul. pediatr.

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Objective: To determine the age of puberty onset in boys and collect anthropometric data of participants at different puberty stages. Methods: This is a cross-sectional study that assessed 430 boys in a random sample representing 48,390 students from public and private schools from the city of Uberaba, Southeast Brazil. The inclusion criteria were males, aged between 5 and 18 years, and absence of previous diseases. Participants and their guardians filled a semistructured questionnaire with questions relevant to their and their parents’ puberty. We set the significance at p<0.05 and calculated the 95% confidence intervals. Results: The mean age found in the puberty stage G2 was 11.2±1.8 (95% of participants in stage G2 were 9.2-13.4 years old). Pubarche data showed a mean of age of 11.0±1.6 years (95% of the participants experienced pubarche when they were 8.0-14.0 years old). When compared to the confidence intervals of two classical studies on the subject, our results showed a trend toward earlier pubarche. In addition, the mean age of this event in the children’s parents was of 12.1±1.4 years, which was significantly higher than the age of the children’s pubarche (p<0.001). Conclusions: These results indicate a secular decreasing trend in pubarche age and an earlier puberty onset. Considering these parameters, is important to design public policies aimed at preventing these early events.

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Section: Introductionmentioning

confidence: 99%

Puberty in a Sample of Brazilian Schoolboys: Onset and Anthropometric Characteristics

Feibelmann

Silva

Santos

et al. 2021

Rev. paul. pediatr.

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“…A trend towards earlier age at menarche was observed in another Brazilian study with girls from private schools comparing cross-sectional data between 2001 and 2010 in which the mean age at menarche decreased from 12.35 to 12.08 years (Castilho et al, 2012). This result was not observed in a study in public schools comparing data on age at menarche at three time points, 1990/1991, 2000/2001 and 2009/2010, in which no statistically significant differences were found (Farias et al, 2012). However, comparisons between these results must take into account socio-economic and health differences between regions (Szwarcwald et al, 2016) and the study year, in addition to the differences in research methodologies.…”

Section: Trends In Age At Menarchementioning

confidence: 77%

“…The understanding of the determinants of menarche in LMIC is comparatively poor, mainly due to a lack of data (Leone & Brown, 2020). Given the importance of this factor as a health predictor and considering the lack of recent studies on the trend of age at menarche in the Brazilian population (Castilho et al, 2012;Farias et al, 2012), this study aims to describe the time trend of age at menarche in schoolgirls from southern Brazil evaluated in 2007Brazil evaluated in , 2012Brazil evaluated in /2013Brazil evaluated in and 2018Brazil evaluated in /2019 to assess its association with being overweight, including obesity, and socio-economic condition.…”

Section: Introductionmentioning

confidence: 99%

Age at menarche and its association with overweight including obesity and socio‐economic conditions of Brazilian schoolgirls: A time‐trend analysis

et al. 2022

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This study aims to describe the time trend of age at menarche in Brazilian schoolgirls evaluated in 2007, 2012/2013 and 2018/2019, and to assess its association with having overweight, including obesity and socio-economic conditions. Three cross-sectional studies were carried out in 2007, 2012/2013 and 2018/2019 in schoolchildren enrolled between the second and ninth years of elementary school and comprising 838, 688 and 326 schoolgirls, respectively. Body mass index Z scores were calculated and categorised as either without overweight or with overweight (including obesity). The type of school (a proxy of socio-economic condition) was categorised as either public or private. Menarche data were collected using the status quo and recall methods. The mean age at menarche was estimated by survival analysis. Differences in age at menarche according to the year of survey, weight status and type of school were verified by the Log-Rank test and Cox's univariate and multiple regression. There was an increase in the prevalence of overweight in girls throughout the surveys, with 21.4% in 2007, 27.2% in 2012 and 28.5% in 2018 (p = 0.007) having overweight. There was a decrease in the mean age at menarche between 2007 and 2018/2019 (12.3 vs. 11.9 years, respectively). The mean age at menarche in girls with overweight was lower in the three time periods when compared to girls without overweight (11.9, 11.8 and 11.5 vs. 12.4, 12.4 and 12.1, respectively).Girls with overweight were more likely to have had earlier age at menarche than girls without overweight (Hazard Ratio 1.57; 95% CI 1.36; 1.80). There were no differences in the age at menarche according to the type of school. The increase in the prevalence of girls with overweight (including obesity) may be associated with the age at menarche. Girls with overweight had a higher risk of earlier age at menarche than girls without overweight.

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“…A previous Brazilian longitudinal study observed a decrease in the age at which boys reached the PH3 stage between 1991 and 2000 (12.9 vs. 12.0 years, p < .01) and between 1991 and 2010 (12.9 vs. 12.0 years, p < .01), and the G4 stage between 2000 and 2010 (13.8, 13.1; p < .01); however, there were no significant differences in girls (Farias et al, 2012).…”

Section: Discussionmentioning

confidence: 97%

Assessment of the median ages at sexual maturation stages of Brazilian schoolchildren according to overweight status and type of school over a 5‐year period: 2007–2012/2013

Matsuo

Adami

Silva

et al. 2021

American J Hum Biol

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Objectives A secular trend of earlier puberty has been observed in girls, and, although more uncertain in boys, is associated with an increasing trend in the prevalence of overweight and obesity. We aimed to compare the median ages of sexual maturation stages in schoolchildren from a city in southern Brazil over a 5‐year period, according to weight status and type of school. Methods Two cross‐sectional studies were performed in 2007 and 2012/2013, including 2215 and 1614 schoolchildren, respectively. Body mass index z‐scores were calculated and categorized as either nonoverweight or overweight (including obesity). The type of school was categorized as either public or private. Sexual maturation was self‐assessed according to the Tanner stages. Mann–Whitney and Kruskal–Wallis tests were performed to compare the median ages of sexual maturation stages. Results The median age decreased for almost all stages over the 5‐year period in both sexes. In boys, the decrease ranged from 0.3 to 1.0 years (stages 2, 3, 4, and 5 for genitalia, and stages 2 and 4 for pubic hair), and from 0.3 to 0.7 years (stages 2, 3, and 4 for breast, and stages 3, 4, and 5 for pubic hair). In 2012, overweight students had lower median ages for most stages compared to those in 2007, especially in girls. Differences by type of school were balanced across years. Conclusions The median age of Tanner's stages after 5 years was reduced in both sexes. In overweight girls, the reduction was more pronounced. The results by type of school were inconsistent.

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Tendência secular de 10 e 20 anos da maturação sexual de escolares

Cited by 4 publications

References 21 publications

Puberty in a Sample of Brazilian Schoolboys: Onset and Anthropometric Characteristics

Puberty in a Sample of Brazilian Schoolboys: Onset and Anthropometric Characteristics

Age at menarche and its association with overweight including obesity and socio‐economic conditions of Brazilian schoolgirls: A time‐trend analysis

Assessment of the median ages at sexual maturation stages of Brazilian schoolchildren according to overweight status and type of school over a 5‐year period: 2007–2012/2013

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