Publications by authors named "Yizhou Lin"

3 Publications

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The influence of socioeconomic status on menarcheal age among Chinese school-age girls in Tianjin, China.

Eur J Pediatr 2021 Mar 12;180(3):825-832. Epub 2020 Sep 12.

Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, Tianjin, China.

The association between socioeconomic status and the onset age of menarche is still not conclusive. This cross-sectional study was conducted among primary and middle school girls aged 7 to 16 years old in Tianjin, China, to explore the distribution of menarcheal age and its association with socioeconomic status. A self-designed structured questionnaire was completed by students and their parents to collect information on socioeconomic status (i.e., family income, parental education level, living residence), menarcheal status, and covariates (weight status of girls and their parents, sleeping hours per day, physical activity). Information on menarcheal status included whether or not menarche had occurred (Yes/No) and the exact age at menarche. Linear regression analysis was used to explore the association between socioeconomic status and menarcheal age before and after covariate adjustment. Among 1485 eligible girls with complete information, 445 had experienced menarche, with an overall menarche rate of 30%. The mean age at menarche was 12.9 years (95% confidence interval 12.8-13.0). Urban girls experienced menarche earlier than rural girls did (12.1 years vs. 13.5 years). Univariate analysis showed that urban residence and higher parental education were associated with earlier onset of menarche. After covariate adjustment, the significance still existed. However, after adjusting further for residence, the significant association with the parental education disappeared. Only urban residence was still significantly associated, even after further adjustment for parental education and family income, with adjusted regression coefficients (95% confidence interval) of - 1.087 (- 1.340,-0.834), indicating that the onset age of menarche among urban girls was 1.087 years (0.834, 1.340) younger than that among rural girls. Family income was not related to the onset age of menarche in any analyses.Conclusion: Urban-rural differences played a more important role in the early onset of menarche than socioeconomic differences between families. What is Known: • The age at menarche varies by race and country, but the global trend is towards earlier onset as a result of changes in nutrition, family structure, socioeconomic status, and physical condition. What is New: • Urban girls experienced menarche earlier than rural girls, but this urban-rural difference could not be explained by family income, parental education, weight status of the participants and their parents, participants' physical exercise and sleeping hours. • Higher parental education was associated with earlier onset of menarche, but this association disappeared after adjustment for living residence.
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http://dx.doi.org/10.1007/s00431-020-03803-4DOI Listing
March 2021

Impact of updated pediatric hypertension criteria on prevalence estimates of hypertension among Chinese children.

J Hum Hypertens 2020 Jun 22. Epub 2020 Jun 22.

Department of Epidemiology and Biostatistics, School of Public Health, and Tianjin Key Laboratory of Environment, Nutrition & Public Health, Tianjin Medical University, Tianjin, China.

This study aimed to evaluate the impact of updated pediatric hypertension (HTN) criteria (the 2017 AAP Guidelines) on prevalence estimates of HTN and prehypertension among Chinese children compared to the 2004 Fourth Report. A total of 2093 children aged 7-15 years from five schools in Tianjin, China were selected using a multistage random cluster sampling method. The prevalence of HTN per the 2017 AAP Guidelines (10.1%) was significantly higher than that per the Fourth Report (6.6%), whereas the prevalence of prehypertension per the 2017 AAP Guidelines (6.3%) was significantly lower than that per the Fourth Report (8.8%). From the 2004 Fourth Report to the 2017 AAP Guidelines, a total of 117 (5.6%) children were reclassified to have higher blood pressure. The two criteria had better consistency in the diagnosis of systolic abnormalities than in the diagnosis of diastolic abnormalities. The updated definitions for pediatric HTN have a substantive impact on the prevalence estimation among Chinese children, especially among boys, overweight children, and older children.
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http://dx.doi.org/10.1038/s41371-020-0370-0DOI Listing
June 2020

An ultra-low energy method for rapidly pre-concentrating microalgae.

Bioresour Technol 2014 Apr 17;158:217-24. Epub 2014 Feb 17.

Seattle University, 901 12th Ave, P.O. Box 222000, Seattle, WA 98122, USA. Electronic address:

This study demonstrates that Nannochloropsis sp. can be effectively separated from its growth medium (0.2-0.3g/L) using electro-coagulation-flocculation in a 100mL batch reactor with nickel electrodes and a treatment time of only 4s. Minimum energy density input for effective separation is 0.03 kWh/m(3). Both energy input and treatment time are much smaller than reported elsewhere. The process results in rapid separation of microalgae (over 90% in 120 min) with minimal damage to algal cells (>90% still alive after processing). At around 4V input, algae can be effectively separated even in very low concentrations. Pulsing is equally effective in separating microalgae as continuous direct current of same magnitude and total exposure time. Algae can separate from their growth medium even if the suspension itself is not treated, but is mixed with treated saltwater with same conductivity. The described method has significant advantages including applicability to continuous processing and water reuse.
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http://dx.doi.org/10.1016/j.biortech.2014.02.033DOI Listing
April 2014