Dose-response relationship between daily screen time and the risk of low back pain among children and adolescents: a meta-analysis of 57831 participants.

BACKGROUND: The risk of low back pain (LBP) increases steeply during adolescence, and adolescents with LBP are more likely to have low back pain in their adult years. This study aimed to investigate the dose-response relationship between daily screen time and the risk of low back pain among children and adolescents. METHODS: PubMed, the Cochrane Library, Embase, and Web of Science were searched to collect relevant studies on daily screen time and the risk of low back pain from the establishment of the database up to December 2022. Two investigators independently screened the literature, extracted data, and evaluated the risk of bias in the included studies. Stata16.0 was used to perform a dose-response meta-analysis and the methodological quality evaluation of the included studies. RESULTS: The results of the meta-analysis showed that there is a positive correlation between daily computer time (OR = 1.32, 1.05-1.60), daily mobile phone time (OR = 1.32, 1.00-1.64), daily TV watching (OR = 1.07, 1.04-1.09) and the risk of low back pain, separately. The dose-response meta-analysis showed that there is a linear relationship between daily computer use and low back pain. The risk of low back pain increased by 8.2% for each 1-hour of daily computer use. CONCLUSIONS: Screen time is related to the risk of low back pain, and there is a linear relationship between daily computer use and the risk of low back pain. A number of strategic measures should be taken to prevent adolescents from developing severe low back pain.

Association study between 834+7G/A and +1332C/T polymorphisms in the growth arrest specific 6 gene and risk of severe preeclampsia in Chinese population / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To investigate the relationship between polymorphisms of the growth arrest specific 6 (GAS6) gene and severe preeclampsia in a South West Han Chinese population.</p><p><b>METHODS</b>Blood samples from 167 patients with severe preeclampsia and 312 normal pregnant women as controls from Han Chinese in Chengdu area were analyzed by polymerase chain reaction-restriction fragment length polymorphisms.</p><p><b>RESULTS</b>C and T allele frequencies for +1332C/T site were 85.63% and 14.37% in the patient group, respectively, and 78.04% and 21.96% in control group, respectively. The TT genotype and variant T allelic frequencies of the +1332C/T polymorphism were significantly lower in patients with severe preeclampsia than in the control group (both P<0.05), and the odds ratio for the risk of severe preeclampsia was 0.602 (95%CI: 0.401-0.904) in carriers for the variant T allele (χ=6.045, P=0.014). G and A allele frequencies for 834+7G/A site were 72.75% and 27.25% in case group, respectively, and 74.36% and 25.64% in control group, respectively. The genotype and allele frequencies of the 834+7G/A polymorphism in patients with severe preeclampsia and controls showed no significant differences (both P>0.05). In addition, there was no significant association between the polymorphisms and blood pressure levels in the patient or control groups.</p><p><b>CONCLUSION</b>The variant GAS6+1332 T allele is associated with a decreased risk for severe preeclampsia in a South West Han Chinese population. On the other hand, the 834+7G/A polymorphism has no effect on the severe preeclampsia.</p>

On the Development and Edification of Canadian Guidelines for the Pharmacoeconomic Evaluation / 中国药房

AIM:To put forward the suggestions for standardizing the pharmacoeconomic research.METHODS:The background of formulation and main points of Canadian Guidelines for the Pharmacoeconomic Evaluation were introduced and its recent development was described.At the same time,we put forward our tentative plan about establishing Chinese guidelines for the pharmacoeconomic evaluation.RESULTS ＆ CONCLUSION:A series of guidelines for the pharmacoeconomic evaluation should be established,which is approved by departments of social safeguard,drug supervision and public health administration,to standardize the pharmacoeconomic research.The goverment should make corresponding policy publicized and make pharmacoeconomic evaluation connect with drug price,clinically rational drug use,catalog of classified management of drugs and catalog of drugs in medical insurance.A pharmacoeconomic framework,which conforms China's national conditions and is controlled by goverment,will established.

Establishment of a real-time PCR method for quantitative detection of a novel metabolic syndrome related gene (MSRG) / 解放军医学杂志

Objective To establish a Taqman real-time PCR assay for quantitative detection of the expression of metabolic syndrome related gene (MSRG) mRNA, and to study the function of a new gene. Methods Specific primers and probes were designed for real-time PCR according to the MSRG cDNA sequence. The plasmid standard preparations were constructed by T-A clone, and serial 10-fold dilutions of the extracted plasmid standard preparations were prepared for plotting the standard curve which was used for relative quantification of real-time PCR. The sensitivity, specificity and reproducibility of real-time PCR assay were detected. To compare with the semi-quantitative RT-PCR, the expression levels of MSRG were measured by real-time PCR and semi-quantitative RT-PCR, respectively, in HepG2 cells which were incubated with glucose in different concentrations [5.6mmol/L (G5.6), 22mmol/L (G22) and 33.3mmol/L(G33.3)]. Results An effective real-time PCR assay was established for detection of MSRG mRNA expression levels. Significant differences existed in MSRG expression in HepG2 cells between the G33.3, G22 and G5.6 groups detected by real-time PCR assay. The expression levels of MSRG in HepG2 cells increased significantly in G33.3 group, whereas no significant difference on the expression level of MRSG mRNA was found between G22 and G5.6 groups when semi-quantitative RT-PCR was used for detection. It suggested that the real-time PCR assay was more sensitive and even more precise than that of semi-quantitative RT-PCR. Conclusion The real-time PCR assay was a sensitive, specific, quantitative, and reproducible tool for studying the function of MSRG at the mRNA expression levels of gene.