Aim To propose a theoretical model of intention to stay (ITS) and examine the effects of perceived organizational support, job control and job satisfaction on ITS. Design Cross‐sectional multicentre survey. Methods The survey was conducted from January 2017‒July 2017 and comprised 3,240 clinical nurses from nine tertiary hospitals in eastern, central and western China, with 2,352 effective responses. Structural equation modelling was used to analyse the relationship between ITS and its correlative factors. Results The hypothesized model was supported. Job control, perceived organizational support and job satisfaction significantly and directly affected nurses' ITS. Furthermore, job control and perceived organizational support showed indirect effects on ITS, which was mediated by job satisfaction. Perceived organizational support could positively influence job control to have a further impact on job satisfaction and ITS. Conclusion Based on a large sample of Chinese tertiary hospital nurses, this study proposed and verified a theoretical model of nurses' ITS, revealing that organization characteristics, work characteristics and affective response to work can have an impact on ITS. Impact This study was the first to examine the relationships among perceived organizational support, job control, job satisfaction and ITS, enriching the theoretical model of ITS. Nurse managers can improve nurses' ITS by enhancing their perceived organizational support, job control and job satisfaction.

The effect of the afternoon napping duration on the risk of depression has not been well established, particularly with regard to sex and age differences. The present study examines the association between afternoon napping duration and depression stratified by sex and age among Chinese adults aged 45 years or older. The 2011 to 2012 survey of the China Health and Retirement Longitudinal Study was utilized, including 5746 participants. We conducted logistic regression with the overall sample and subjects stratified by sex and age. Elderly men with short napping (<30 minutes) had lower odds of having depression symptoms compared with those with no napping group (OR = 0.66, 95% CI = 0.44–0.97). In addition, the finding indicated that middle-aged women with long napping (≥90 min) had a marginally significant difference than those in reference, which showed a negative effect on depression (OR = 0.72, 95% CI = 0.51–1.01). Our findings revealed that extended daytime napping duration can decrease the risk of depression status among middle and elderly people. Moreover, relevant promotion measures should be adopted, such as a suitable rest environment and regular napping habits. The potential mechanism should be clarified by a longitudinal survey to examine the specific causality.

When a developing country reaches a relatively average income level, it often stops growing further and its income does not improve. This is known as the middle-income trap. How to overcome this trap is a longstanding problem for developing countries, and has been studied in various research fields. In this work, we use the Fitness-Complexity method (FCM) to analyze the common characteristics of the countries that successfully get through the middle-income trap, and show the origin of the middle-income trap based on the international trade network. In the analysis, a novel method is proposed to characterize the interdependency between products. The results show that some middle-complexity products depend much on each other, which indicates that developing countries should focus on them simultaneously, implying high difficulty to escape the middle-income trap. To tackle the middle-income trap, developing countries should learn experiences from developed countries that share similar development history. we then design an effective method to evaluate the similarity between countries and recommend developed countries to a certain developing country. The effectiveness of our method is validated in the international trade network.

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Objective: To examine the association between occupational class and high-sensitivity C-reactive protein (hsCRP) in Korean workers. Methods: We used a nationally representative sample of Koreans (n = 2591) aged 19 to 65 years from the 2015 Korea National Health and Nutrition Examination Survey. The concentration of hsCRP (mg/L) was assessed by a high sensitivity immunoturbidimetric assay. Current occupation was categorized as: white-collar (managers/professionals), pink-collar (clerks/service/sales), blue-collar (craft/equipment/machine-assembling, agricultural/forestry/fishery, and elementary-level labor), or unemployed. Cross-sectional linear regression models adjusted for sociodemographic/work-related/health conditions and behaviors. Results: Compared with blue-collar workers, white-collar workers showed significantly higher levels of hsCRP (β = 0.16, 95% CI: 0.02, 0.30) after adjusting for all covariates, whereby the pattern was more pronounced among professionals. However, the association was not significant for unemployed and pink-collar workers. Conclusions: Findings suggest that Korean white-collar workers, particularly professionals, have elevated levels of inflammation.