Introduction Physical activity is recommended for healthy pregnant women. Clinical practice guidelines vary with regard to initial time, duration, or type of physical activity that is recommended, which is confusing for health care professionals and pregnant women alike. This study aimed to appraise clinical guidelines relevant to physical activity for pregnant women and summarize consensus and discrepant recommendations. Methods The websites of organizations that develop guidelines including those of obstetricians, gynecologists, midwives, and medical sports associations were searched in addition to 9 literature databases for the period from January 2010 through November 2020. Guidelines were included if they were published in a journal or on a website in English or Chinese; were labeled as a recommendation guideline, position paper, practice parameter, or consensus statement; and addressed physical activity for pregnant women. Two authors independently extracted recommendations. Four reviewers independently assessed guideline quality using the AGREE II instrument. Results Thirteen guidelines met the inclusion criteria. The guidelines developed by the World Health Organization and the National Institute for Health and Clinical Excellence were deemed to have the highest methodological quality. The recommendations were consistent with regard to recommended exercise duration, frequency, intensity, and type of physical activity. The main discrepant recommendations included best tools for conducting pre‐exercise screening and assessing intensity of exertion. Guidelines also differ on optimal heart rate during exercise, when in pregnancy to initiate an exercise regimen, and duration or frequency of strengthening exercises. Discussion Of the 13 guidelines, 2 were found to have good methodological quality. The recommendations that were consistent across the differing guidelines can support health care providers in counseling women about physical activity during pregnancy. The recommendations that are discrepant among these guidelines may contribute to confusion and a reluctance to recommend exercise during pregnancy. Research is needed to clarify discrepant recommendations.

AimsThis study aims to examine the prevalence of anxiety symptoms and identify predictors of anxiety among pregnant women with gestational diabetes mellitus and their partners and explore the mediating role of marital satisfaction between maternal and paternal anxiety.DesignA cross‐sectional study was conducted in Guangzhou, China, from July 2021 to May 2022.MethodsA total of 306 dyads of pregnant women with gestational diabetes mellitus and their partners completed the State–Trait Anxiety Inventory, Locke–Wallace Marital Adjustment Test and the socio‐demographic and clinical data sheet.ResultsThe prevalence of anxiety symptoms was 32.4% and 36.6% in pregnant women with gestational diabetes mellitus and their partners, respectively. The predictors of maternal anxiety were paternal anxiety, maternal marital satisfaction, maternal monthly salary, fasting glucose value and 1‐h glucose value. By contrast, the predictors of paternal anxiety were maternal anxiety, paternal marital satisfaction and paternal monthly salary. Moreover, the relationship between maternal and paternal anxiety was mediated by marital satisfaction.ConclusionsThe anxiety symptoms of pregnant women with gestational diabetes mellitus and their partners influence each other, and this relationship was mediated by marital satisfaction. Every couple should be screened for anxiety symptoms and treated as a team rather than focusing solely on the pregnant woman.

AimThis review aimed to appraise clinical guidelines about exercise for women with gestational diabetes mellitus and summarize consensus and inconsistent recommendations.BackgroundExercise is an effective non‐pharmacological therapeutic for gestational diabetes mellitus, but the variety of relevant clinical practice guidelines is confusing for healthcare professionals.DesignThis is a systematic review of clinical practice guidelines.Data SourcesWebsites of guideline development institutions, eight literature databases and organizations of obstetricians, gynaecologists, midwives, and medical sports associations were searched for guidelines published from January 2011 to October 2021.Review MethodsTwo reviewers independently extracted recommendations. Four reviewers assessed guideline quality using the AGREE II instrument independently.ResultsFifteen guidelines were included. All women with diabetes are recommended to exercise during pregnancy. The consistent recommendations were for pre‐exercise screening, for 30 min per exercise session on 5 days of the week or every day after meals, exercise at moderate intensity, using aerobic and resistance exercise, and walking. The main non‐consistent recommendations included warning signs for women on insulin during exercise, minimum duration per session, intensity assessment, duration and frequency of sessions for strengthening and flexibility exercise and detailed physical activity giving birth.ConclusionsGuidelines strongly support pregnant women with diabetes to exercise regularly. Research is needed to make non‐consistent recommendations clear.

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This paper is motivated by the prevailing pricing structure and competition in Chinese food-delivery market. Currently, two oligarchs in China's food-delivery market are Meituan-Dianping Takeout and ELEME Takeout, which accounting for more than 95% of the market share. Both of these platforms charge a percentage commission based on per-transaction price and involve per-agent fee. So far, few research has been found to make analysis under such realistic pricing structure, and we help to fill this gap by developing a model for platform competition based on the model developed by Armstrong. The results we get under the realistic pricing structure and cost verify the propositions of Armstrong under per-transaction fee, which may stem from that the percentage commission charged on per-transaction price is similar to the per-transaction fee.