Women aged 18–49 years are women of childbearing age. Their nutrition knowledge (NK) is not only related to their physical health but also affects the diet quality of the entire family and the health status of the next generation. Studies that assess the NK level of women of childbearing age using representative data in China are lacking. This study aimed to evaluate the NK level of Chinese women aged 18–49 years and explore influencing factors at both the individual and provincial levels. Data were from the Chinese Nutrition and Health Knowledge Survey 2021. A total of 38,065 females aged 18–49 years were included in the analysis. A face-to-face validated standard questionnaire was used to collect NK from respondents. The full score of the questionnaire was 100. Respondents who scored higher than 75 were considered to have NK. The Rao-Scott chi-square test was used to compare the differences in the NK awareness rate between or among the subgroups. A multilevel logistic regression model was used to explore influencing factors at the individual and provincial levels. All analyses accounted for complex sample design including clustering, stratification, and sample weights. The mean score of NK among Chinese women aged 18–49 years was 65.1 ± 11.8, and the awareness rate was 20.9% (95% CI: 19.6−22.3%). Among the five dimensions, the awareness rate of food safety was the highest (74.0%, 95% CI: 72.8−75.3%), and the dietary recommendation was the lowest (16.4%, 95% CI: 15.3−17.5%). The two-level logistic regression model analysis revealed that at the individual level, age, education level, occupation, chronic disease status and residence were the main influencing factors of the NK level. At the provincial level, the region and the female illiteracy rate were associated with the NK level. Dependent children ratio, per capita income, and health expenditure were not significantly associated with the NK level. The model accounted for 58.8% of the variance in the NK level. The NK level of Chinese women aged 18–49 years was low. Knowledge of dietary recommendations was weakest. Both individual and provincial-level factors were associated with the NK level. There is an urgent need to strengthen nutrition education actions for enhancing the NK of reproductive-age women effectively to improve their dietary behaviors.

IntroductionLarge-scale land rentals are a fundamental way of realizing the moderate-scale operation and transformation of modern agriculture. As the suppliers and main demanders in the land rental market, the decision-making logic of farmer households determines the scale of land rentals. However, land rentals have been plagued by the prominent issues of farmer households' insufficient participation and fragmented rental transactions. It is importance and urgent to promote farmer households' participation in large-scale land rental market.MethodsBased on a sample of 4,815 farmer households from the China Family Panel Studies (CFPS) database, this study applied Bivariate Tobit (Bi-Tobit) model to investigate the correlation between farmer households' decisions of rented-in and rented-out area, and analyzed the determinants and inherent logics of the decision making. Heterogeneity analysis was made to examine the difference in surplus and indebted farmer households.ResultsThe results showed that there was a significantly negative correlation between the household rented-in area and the rented-out area. The land value had significantly positive effect on the rented-in area and the rented-out area. Household social security had a significantly positive effect on the rented-out area, but had no significant effect on the rented-in area. For indebted households, only social security significantly affected their decisions of rented-out area, while for surplus households, land value rather than social security became the significant determinant of rented-in and rented-out area.DiscussionFarmer households' land rented-in area and rented-out area have comprised a dual decision with a significant negative correlation. Facing the dual functions of creating economic value and providing social security of rural land, farmer households' decision-making logic of rented-in area is dominated by economic rationality, whereas that of rented-out area involves the coexistence of economic rationality and survival rationality. With the improvement of household income level, the dominant logic of the decisions of land rental area transformed from survival rationality to economic rationality. Policies should enhance the rural social security system to increase land rental area, especially by providing adequate social security for farmer households with a lower income level.