RÉSUMÉ
Objective To assess the nutritional status of vitamin D and associated factors among adults of six ethnic minority groups native to Yunnan Province,and provide evidence for policy making.Methods Between May 2019 and August 2020,a total of 690 adults were selected from Jinuo,Bulang,Jingpo,Deang,Achang and Pumi ethnic groups according to the sex and age composition in the 6th national census.A questionnaire survey and an anthropometric examination were conducted by trained health workers,and serum 25(OH)D levels were determined with high-performance liquid chromatography-tandem mass spectrometry.Results The median of serum 25(OH)D was 28.7(P25～P75∶24.3～33.8)ng/mL,and the prevalence of vitamin D sufficiency,insufficiency and deficiency were 44.2%、47.5%and 8.3%,respectively.There were significant differences in serum 25(OH)D levels among the six ethnic groups(χ2=139.29,P<0.01).Multivariate logistic regression showed that ethnic groups living in higher latitude areas(Pumi,Jingpo,Deang,and Achang),women,and those whose BMI≥24.0 were more likely to be vitamin D insufficient or deficient.Conclusion More than half of the ethnic adults suffer from vitamin D malnutrition which also varies across ethnicities.Further surveillance and interventions among key areas and populations are needed.
RÉSUMÉ
<p><b>OBJECTIVE</b>To investigate the status of exclusive breastfeeding(EBF) and possible influencing factors during 0-7 days postpartum in China.</p><p><b>METHODS</b>During 2011 to 2013, healthy mothers and neonates who were in the period of 0- 7 days postpartum from 8 provinces across different regions of China were recruited to take the questionnaire investigations and physical examinations. Information about socio-economic, pregnant, and delivery status, infant healthy situation and feeding indicators was collected to calculate the rate of exclusive breastfeeding during 0- 7 days postpartum and analyze the influencing factors.</p><p><b>RESULTS</b>A total of 1 882 pairs of mothers and neonates were covered by this study. The rate of EBF was 13.3% (250 cases) during 0- 7 days postpartum. Bottle feeding (OR=0.08, 95% CI: 0.05- 0.12), the mothers themselves mixed fed at their 0-4 months old (OR=0.22, 95%CI: 0.08-0.58), the mothers who had used methods to stimulate milk secretion (OR=0.58, 95% CI: 0.35- 0.94) might decrease the EBF rate. Compared with the mothers who believed that their breast milk was not enough for their infants, the mothers who believed breastmilk was enough may increase the EBF rate (OR=6.04, 95%CI: 3.34-10.94). Comparing to the EBF rate of Beijing, Yunnan (OR=0.10, 95%CI: 0.04-0.24), and Gansu(OR=0.03,95%CI: 0.01-0.08) had lower EBF rate during 0-7 days postpartum. What's more, the EBF rate increased with the increasing neonates' age (OR=1.33, 95% CI: 1.16- 1.53).</p><p><b>CONCLUSION</b>The EBF rate during 0- 7 days postpartum is still low in China and had significant differences in different regions. Suboptimal feeding knowledge and practices affected the EBF rate significantly.</p>