Objective To investigate the prevalence of vitamin D deficiency and its associated metabolic risk factors in the healthy adults in Gansu Province, a western province of China.Methods Through stratified, multistage probability population sampling, 11 300 adults (4 740 men and 6 417 women aged 18-79 years) who had been living in their current residence for at least 5 years were arbitrarily chosen from seven representative geographical cities in Gansu Province from June 2014 to December 2015.The data obtained from a questionnaire-based survey, anthropometric and biochemical assessments, and areal bone mineral density measurement were collected and analyzed.Results The overall mean serum 25(OH)D was (16.07±9.40) μg/L.The prevalence of severe deficiency (<10 μg/L), deficiency (≥10 μg/L and <20 μg/L), insufficiency (≥20 μg/Land <30 μg/L), and sufficiency (≥30 μg/L) among these adults were 17.3％, 64.6％, 11.8％, and 6.3％, respectively.The significant predictors of vitamin D deficiency included younger age and female sex(P<0.05), whereas sun exposure, physical activity, and calcium supplementation were protective (P<0.05).Serum 25(OH)D was inversely associated with parathyroid hormone (r=-0.279, P<0.001) and positively associated with serum calcium (r=0.239, P<0.001), serum phosphorus (r=0.090, P=0.018), low-density lipoprotein cholesterol(r=0.100, P=0.008), and body mass index (r=0.093, P=0.014).The 25(OH)D concentration showed no significant correlation with bone mineral density (P>0.05).Conclusions Vitamin D deficiency is highly prevalent among adult populations in Gansu, northwestern of China, and is largely attributed to younger age and female sex.The cumulative effects of factors including sun exposure, physical activity, and calcium supplementation play an influential role in maintaining vitamin D levels.

Objective To investigate the prevalence and epidemiological characteristics of hypothyroidism, possible related lifestyle and metabolic risk factors of hypothyroidism in adults of Gansu province, and to provide scientific evidence for the prevention of hypothyroidism. Methods Stratified multi-stage cluster sampling with probability proportionate to size method was used to collect data from 10071 residents aged 18 to 79 years and who had lived in the local area for more than 5 years. All participants were asked to fill in the questionnaire, and to take physical examination including anthropometric measurements and venous blood samples. Risk factors of hypothyroidism were analyzed by Chi-square test and multivariate logistic regression analysis. Result The prevalence of hypothyroidism was 10.1％ (overt hypothyroidism: 1.5％, subclinical hypothyroidism: 8.7％). Female (12.1％) had a higher percentage when compared to male (7.5％). In addition to the increased odds with older age and female gender, current or previous smoking history (OR: 0.467, 95％CI: 0.289-0.754, P=0.002), salty taste preference (OR:0.355, 95％CI:0.162-0.776, P=0.022) and a frequent seafood intake (OR:0.148, 95％CI:0.057-0.385, P<0.001) were tended to be associated with reduced risk of hypothyroidism. Logistic regression analysis showed that positive thyroid peroxidase antibodies (OR:1.976, 95％CI:1.037-3.768, P=0.039), positive thyroglobulin antibodies (OR:2.419, 95％CI:1.160-5.043, P=0.018) and triglycerides (OR:1.241, 95％CI:1.044-1.474, P=0.014) were associated with increased risk of hypothyroidism. Conclusion The prevalence of hypothyroidism in Gansu province was high, affecting approximately one in ten adults, and majority of which were SCH. Both lifestyle factors and metabolic factor were associated with hypothyroidism. Developing a healthy lifestyle at work and home, and paying attention to the control of blood lipids are conducive to the prevention of hypothyroidism.

BACKGROUND: Insulin-like growth factor 1(IGF-1) plays an important role in regulating osteocyte function and bone metabolism. The association of insulin-like growth factor 1 receptor (IGF-1R) gene polymorphisms with osteoporosis in postmenopausal women has not yet been reported.OBJECTIVE: To investigate the correlation between IGF-1R gene rs2229765 single nucleotide polymorphism and osteoporosis in postmenopausal women.METHODS: IGF-1R gene rs2229765 SNPs were detected using PCR-RFLP in 218 patients with postmenopausal osteoporosis and 270 postmenopausal women with normal bone mineral density. The bone mineral density of the lumbar spine, femoral neck and forearm was determined by dual-energy X-ray absorptiometry. Serum IGF-1 level was investigated by ELISA.RESULTS AND CONCLUSION: The AA genotype (29% vs. 17%, P=0.001) and A allele (51% vs. 40%, P=0.000)distributions of the rs2229765 polymorphism in the osteoporosis group were significantly higher than those in the control group. Compared with GG genotype of rs2229765, AA genotype was significantly associated with an increased risk of osteoporosis (OR=2.12, 95%CI=1.27-3.54, P=0.004). The analysis of serum IGF-1 showed that osteoporotic women with rs2229765AA (P=0.007) and GA (P=0.016) genotype were found to have a lower serum IGF-1 level than osteoporotic women with GG genotype. Our results indicate that the IGF-1R gene rs2229765 polymorphism capable of regulating serum IGF-1 level is associated with postmenopausal osteoporosis.