Objective: To explore the associations among achievement goal orientation, learning stress and sleep quality among middle school students. Methods: A total of 5 781 students were recruited from 14 middle schools in Guangzhou by a stratified cluster random sampling method. These students were investigated with learning stressors (SSA), achievement goal orientation (ADG), and Pittsburgh Sleep Quality Index (PSQI). Results: The mean score of four aspects of achievement goal orientation was as follows: performance approach (25.98±6.76), performance avoidance (15.52±4.12), mastery approach (25.87±6.77), mastery avoidance (15.19±4.12). The average score of learning stress and sleep quality was (149.53±42.46) and (6.45±2.86), respectively. Performance approach, mastery avoidance and performance avoidance positively associated with learning stress and sleep quality(r=0.12-0.53, P<0.01). Mastery approach was negatively correlated with learning stress and sleep quality (r=-0.14-0.22, P<0.01). Four types of achievement goal orientation both had a direct effect on sleep quality. Performance avoidance and mastery approach indirectly affected sleep quality through learning stress. Conclusion Achievement goal orientation of middle school students closely relates to learning stress and sleep quality; performance avoidance and mastery approach indirectly affects sleep quality through learning stress. Positive achievement goal orientation helps to reduce learning stress, which would lead to sleep quality improvement among middle school students.

Objective: To explore the mediating effect of hemoglobin (Hb) and hematocrit (HCT) on the association between alcohol consumption and blood pressure, and provide evidence for the prevention and control of alcohol-attributed hypertension. Methods: 1 091 male (age >50 years old) participants with drinking habit were selected from the Guangzhou biobank cohort study (GBCS). Mediation analysis was used to evaluate the mediating effect of Hb and HCT on the association of alcohol consumption (unit/day) with systolic blood pressure (SBP), diastolic blood pressure(DBP), pulse pressure(PP) and mean arterial pressure (MAP). Results: After adjusting for age, body mass index, education level, personal annual income, smoking, occupation and physical activity, the associations of alcohol consumption with SBP, DBP, PP and MAP were partly mediated by Hb, the proportion of mediating effect was 11.8% (95%CI 4.8%-24.7%), 15.3% (95%CI 6.5%-32.0%), 8.4% (95%CI 2.2%-22.5%) and 13.5% (95%CI 5.9%-27.5%), respectively. The associations of alcohol consumption with SBP, DBP, and MAP were also partly mediated by HCT, the proportion of mediating effect was 6.3% (95%CI 1.0%-16.0%), 8.7% (95%CI 1.4%-21.4%), and 7.5% (95%CI 1.0%-18.6%), respectively. Conclusion There is a significant mediating effect of Hb and HCT on the association between alcohol consumption and blood pressure. Besides efforts on alcohol control, the potential effects of alcohol-induced increase on Hb and HCT, which might also increase the blood pressure, need to be considered to achieve optimal monitoring and prevention of alcohol-related hypertension.

Objective To examine the association between weight changes during early and middle adulthood and the risk of type 2 diabetes mellitus in middle aged and elderly population.Methods Based on the Guangzhou Biobank Cohort Study (GBCS),28 736 residents aged ≥50 years were included in Guangzhou.Multivariate logistic regression was used to analyze the association between body weight changes during early or middle adulthood and age when the heaviest weight reaching the threshold on the risk of type 2 diabetes mellitus in middle age or elderly population.Adjustments on age,smoking,alcohol consumption,physical activity,education level,occupation,district of residence and body mass index etc.,were made.Results The mean age was 64.3 (standard deviation=6.7) years in men and 61.0 (standard deviation=7.0) years in women,with the prevalence rates of diabetes as 13.1％ and 13.7％ in men and women,respectively.Compared to those with stable body weight,the risk of diabetes increased with weight gain during early and middle adulthood in both men and women (both P values for trend ＜0.01).Participants who gained more than 20 kg during early and middle adulthood were associated with the highest risk of diabetes in men (OR=2.83,95％ CI:1.99-4.02) and women (OR=3.13,95％CI:2.47-3.96).Compared to those who reached the highest weight at age 20,those who reaching the highest weight at 40 to 49 years were associated with the highest risk of diabetes,with OR being 5.32 (95％CI:1.92-14.8) in men and 3.41 (95％CI:2.49-4.67) in women,respectively.Weight loss in adulthood was associated with self-reported but not newly diagnosed diabetic cases in both middle and older aged men and women.Conclusion Weight gain during early and middle adulthood may increase the risk of diabetes in middle and older aged population.The detrimental effect of obesity on diabetes might become significantly visible in the next decades.

OBJECTIVE: ABO genotyping for forensic identification by oligonucleotide chip. METHODS: Oligonucleotide microarrays which could detect 3 different SNPs in exon 6 and exon 7 for ABO genotyping were used. Population studies on ABO was carried out in a sample of 115 unrelated Chinese Han individuals. The method was also applied to cases. RESULTS: The technique could identify 6 genotypes of ABO system. According to the results of population studies, no significant deviations from Hardy-Weinberg equilibrium could be found. The observed and expected heterozygosities were 0.591 and 0.616 respectively. The polymorphic information content was 0.544. The average exclusion probabilities in buos and trios was 0.188 and 0.344 respectively. The discrimination power is 0.777. CONCLUSION The data and case application demonstrated that ABO typing by oligonucleotide probe arrays was a useful technique for paternity testing and individual identification.
ABO Blood-Group System/genetics* ; Blood Stains ; DNA/blood* ; DNA Primers ; Female ; Forensic Medicine ; Genotype ; Hair/chemistry* ; Humans ; Oligonucleotide Array Sequence Analysis