Age at spermarche: 15‐year trend and its association with body mass index in <scp>C</scp>hinese school‐aged boys

Song, Yi; Ma, Jun; Wang, Haijun; Wang, Zhiqiang; Lau, Patrick W.C.; Agardh, Anette

doi:10.1111/ijpo.12073

Cited by 18 publications

(31 citation statements)

References 27 publications

(75 reference statements)

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“…Among those who had experienced menarche or spermarche (97.3% of girls and 74.5% of boys), the mean grade of menarche or spermarche was 8.13 ± 1.8 for boys and 7.27 ± 1.3 for girls. The average grade by which menarche/spermarche were achieved were similar to those reported previously (Negriff & Susman, 2011;Song et al, 2015).…”

Section: Covariatessupporting

confidence: 87%

Pubertal development, physical activity, and sedentary behavior among South Korean adolescents

Lee¹,

Carson²,

Spence³

2017

Acta Gymnica

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Section: Covariatessupporting

confidence: 87%

Pubertal development, physical activity, and sedentary behavior among South Korean adolescents

Lee¹,

Carson²,

Spence³

2017

Acta Gymnica

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“…One explanation is that Chinese girls prefer to be slim leading to dietary restriction (23.6% in girls vs. 9.1% in boys according to a national survey in 2005) and thus benefit less from food availability or diversity (Song, Wang, Ma, & Wang, ). Alternatively, school‐aged girls enter puberty about 2 years earlier (Song et al, ; Song et al, ), and menstruation may increase girls' vulnerability to anaemia (Friedman et al, ) and lesser reduction with economic growth.…”

Section: Discussionmentioning

confidence: 99%

“…Alternatively, school-aged girls enter puberty about 2 years earlier (Song et al, 2014;Song et al, 2016), and menstruation may increase girls' vulnerability to anaemia (Friedman et al, 2012) and lesser reduction with economic growth.…”

Section: Discussionmentioning

confidence: 99%

The associations of economic growth and anaemia for school‐aged children in China

Luo

et al. 2020

Maternal & Child Nutrition

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Economic growth has brought improvements in many areas of child health, but its effects on anaemia among school‐aged children remain unknown. However, this is important because iron deficiency anaemia is common and is the main cause of disability‐adjusted life years for school‐aged children. In this study, we included 429,222 Chinese children aged 7–17 years from five consecutive national cross‐sectional surveys during 1995–2014. Using altitude‐adjusted haemoglobin concentration measured from capillary blood samples, we defined anaemia status according to World Health Organization's recommendation. We used logistic regressions weighted by provincial population to examine the association between provincial gross domestic product (GDP) per capita and anaemia, adjusting for sex, age, urban–rural location, regional socio‐economic status (SES), fixed effect of province, and clustering of schools. We used generalised additive mixed models to evaluate a potentially non‐linear relationship. For each 100% growth in GDP per capita, there was a 40% (odds ratio [OR] = 0.60; 95% confidence interval [CI; 0.56, 0.65]) reduction in anaemia. However, the association was weaker for girls and in cities with a lower SES. The association was weaker across 2005–2014 (OR = 0.75, 95% CI [0.62, 0.90]) compared with 1995–2005 (OR = 0.52; 95% CI [0.44, 0.61]), reflecting a weaker association when GDP per capita reaches around $2,000. The results were similar for moderate‐to‐severe anaemia. We concluded that economic growth has been associated with reductions in anaemia among school‐aged children in China but with fewer benefits for girls and those in poorer settings. Further economic development in China is unlikely to bring similar reductions in anaemia, suggesting that additional population level and targeted interventions will be needed.

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“…Only a few studies have examined the relationship between puberty and body mass index (BMI) among boys by using different measures [e.g., voice break, age at onset of pubertal growth spurt, peak height velocity, public hair growth, testicular volume, and/or penis length], and the results reported have been inconsistent 17, 18, 19, 20, 21. However, a recent study examining the trend of age at spermarche and its association with BMI among Chinese school boys found that a higher BMI or BMI-for-Age z -score was associated with an increased likelihood of having reached spermarche, indicating the overlapping trend of earlier age at spermarche with increase in BMI over the past 15 years among Chinese boys [3].…”

Section: Introductionmentioning

confidence: 99%

Timing of Spermarche and Menarche are Associated with Physical Activity and Sedentary Behavior Among Korean Adolescents

Lee

Pabayo

Kawachi

2016

Osong Public Health and Research Perspectives

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ObjectivesThis study examined the timing of menarche and spermarche and their associations with physical activity (PA) and sedentary behavior (SB) after controlling for body mass index (BMI).MethodsMultiple logistic regression analyses were conducted to determine whether the timing of menarche in girls and spermarche in boys is associated with PA and SB independent of BMI in a nationally representative sample of Korean adolescents (13–18 years; N = 74,186).ResultsAfter controlling for age, family economic status, and BMI, early timing of spermarche among boys was associated with a higher likelihood of engaging in PA and a lower likelihood of engaging in SB for < 2 hours during weekdays. By contrast, boys with late timing of spermarche were less likely to engage in PA and more likely to engage in SB for < 2 hours. Among girls, early or late timing of menarche was associated with a higher likelihood of engaging in PA and a lower likelihood of engaging in SB.ConclusionTiming of menarche in girls and spermarche in boys could be a marker for PA and SB among Korean adolescents. To promote PA and discourage SB among Korean adolescents, school-based, grade-specific interventions can be tailored by the absence or presence of menarche/spermarche.

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Age at spermarche: 15‐year trend and its association with body mass index in Chinese school‐aged boys

Cited by 18 publications

References 27 publications

Pubertal development, physical activity, and sedentary behavior among South Korean adolescents

Pubertal development, physical activity, and sedentary behavior among South Korean adolescents

The associations of economic growth and anaemia for school‐aged children in China

Timing of Spermarche and Menarche are Associated with Physical Activity and Sedentary Behavior Among Korean Adolescents

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