[Risk factors for different types of hypospadias].

Objective: To explore the risk factors for different types of hypospadias.

Methods: According to the 1∶1 ratio, we included hypospadias children in the case group and those without urinary abnormality as controls, all from the Third Affiliated Hospital of Zhengzhou University between October 2015 to October 2016. Using univariate and multivariate logistic regression analyses, we investigated the risk factors for hypospadias as well as for four different types of the disease.

[A Meta analysis of the efficacy of high-frequency oscillatory ventilation versus conventional mechanical ventilation for treating pediatric acute respiratory distress syndrome].

Objective: To systematically assess the clinical efficacy of high-frequency oscillatory ventilation (HFOV) and conventional mechanical ventilation (CMV) for treating pediatric acute respiratory distress syndrome (ARDS).

Methods: Data from randomized controlled trials comparing HFOV and CMV in the treatment of pediatric ARDS published before July 2016 were collected from the Cochrane Library, PubMed, Medline, CNKI, and Wanfang Data. Literature screening, data extraction, and quality assessment were performed by two independent reviewers according to the inclusion and exclusion criteria.

Determination of injection molding process windows for optical lenses using response surface methodology.

This study focuses on injection molding process window determination for obtaining optimal imaging optical properties, astigmatism, coma, and spherical aberration using plastic lenses. The Taguchi experimental method was first used to identify the optimized combination of parameters and significant factors affecting the imaging optical properties of the lens. Full factorial experiments were then implemented based on the significant factors to build the response surface models.