Global burden and strength of evidence for 88 risk factors in 204 countries and 811 subnational locations, 1990–2021: a systematic analysis for the Global Burden of Disease Study 2021

Background: Understanding the health consequences associated with exposure to risk factors is necessary to inform public health policy and practice. To systematically quantify the contributions of risk factor exposures to specific health outcomes, the Global Burden of Diseases, Injuries, and Risk Factors Study (GBD) 2021 aims to provide comprehensive estimates of exposure levels, relative health risks, and attributable burden of disease for 88 risk factors in 204 countries and territories and 811 subnational locations, from 1990 to 2021. Methods: The GBD 2021 risk factor analysis used data from 54 561 total distinct sources to produce epidemiological estimates for 88 risk factors and their associated health outcomes for a total of 631 risk–outcome pairs. Pairs were included on the basis of data-driven determination of a risk–outcome association. Age-sex-location-year-specific estimates were generated at global, regional, and national levels. Our approach followed the comparative risk assessment framework predicated on a causal web of hierarchically organised, potentially combinative, modifiable risks. Relative risks (RRs) of a given outcome occurring as a function of risk factor exposure were estimated separately for each risk–outcome pair, and summary exposure values (SEVs), representing risk-weighted exposure prevalence, and theoretical minimum risk exposure levels (TMRELs) were estimated for each risk factor. These estimates were used to calculate the population attributable fraction (PAF; ie, the proportional change in health risk that would occur if exposure to a risk factor were reduced to the TMREL). The product of PAFs and disease burden associated with a given outcome, measured in disability-adjusted life-years (DALYs), yielded measures of attributable burden (ie, the proportion of total disease burden attributable to a particular risk factor or combination of risk factors). Adjustments for mediation were applied to account for relationships involving risk factors that act indirectly on outcomes via intermediate risks. Attributable burden estimates were stratified by Socio-demographic Index (SDI) quintile and presented as counts, age-standardised rates, and rankings. To complement estimates of RR and attributable burden, newly developed burden of proof risk function (BPRF) methods were applied to yield supplementary, conservative interpretations of risk–outcome associations based on the consistency of underlying evidence, accounting for unexplained heterogeneity between input data from different studies. Estimates reported represent the mean value across 500 draws from the estimate's distribution, with 95% uncertainty intervals (UIs) calculated as the 2·5th and 97·5th percentile values across the draws. Findings: Among the specific risk factors analysed for this study, particulate matter air pollution was the leading contributor to the global disease burden in 2021, contributing 8·0% (95% UI 6·7–9·4) of total DALYs, followed by high systolic blood pressure (SBP; 7·8% [6·4–9·2]), smoking (5·7% [4·7–6·8]), low birthweight and short gestation (5·6% [4·8–6·3]), and high fasting plasma glucose (FPG; 5·4% [4·8–6·0]). For younger demographics (ie, those aged 0–4 years and 5–14 years), risks such as low birthweight and short gestation and unsafe water, sanitation, and handwashing (WaSH) were among the leading risk factors, while for older age groups, metabolic risks such as high SBP, high body-mass index (BMI), high FPG, and high LDL cholesterol had a greater impact. From 2000 to 2021, there was an observable shift in global health challenges, marked by a decline in the number of all-age DALYs broadly attributable to behavioural risks (decrease of 20·7% [13·9–27·7]) and environmental and occupational risks (decrease of 22·0% [15·5–28·8]), coupled with a 49·4% (42·3–56·9) increase in DALYs attributable to metabolic risks, all reflecting ageing populations and changing lifestyles on a global scale. Age-standardised global DALY rates attributable to high BMI and high FPG rose considerably (15·7% [9·9–21·7] for high BMI and 7·9% [3·3–12·9] for high FPG) over this period, with exposure to these risks increasing annually at rates of 1·8% (1·6–1·9) for high BMI and 1·3% (1·1–1·5) for high FPG. By contrast, the global risk-attributable burden and exposure to many other risk factors declined, notably for risks such as child growth failure and unsafe water source, with age-standardised attributable DALYs decreasing by 71·5% (64·4–78·8) for child growth failure and 66·3% (60·2–72·0) for unsafe water source. We separated risk factors into three groups according to trajectory over time: those with a decreasing attributable burden, due largely to declining risk exposure (eg, diet high in trans-fat and household air pollution) but also to proportionally smaller child and youth populations (eg, child and maternal malnutrition); those for which the burden increased moderately in spite of declining risk exposure, due largely to population ageing (eg, smoking); and those for which the burden increased considerably due to both increasing risk exposure and population ageing (eg, ambient particulate matter air pollution, high BMI, high FPG, and high SBP). Interpretation: Substantial progress has been made in reducing the global disease burden attributable to a range of risk factors, particularly those related to maternal and child health, WaSH, and household air pollution. Maintaining efforts to minimise the impact of these risk factors, especially in low SDI locations, is necessary to sustain progress. Successes in moderating the smoking-related burden by reducing risk exposure highlight the need to advance policies that reduce exposure to other leading risk factors such as ambient particulate matter air pollution and high SBP. Troubling increases in high FPG, high BMI, and other risk factors related to obesity and metabolic syndrome indicate an urgent need to identify and implement interventions

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Impact of a Formal Lactation Curriculum for Residents on Breastfeeding Rates Among Low-Income Women.

Obstetrics-gynecology residents have inadequate training in lactation management and are typically unable to address basic breastfeeding needs. A retrospective study was performed to evaluate the impact of a formal lactation curriculum for obstetrics-gynecology residents on breastfeeding. Demographic information, medical history, and breastfeeding rates were derived from medical records and hospital lactation logs. Breastfeeding outcomes of women with term, singleton infants were analyzed before and after curriculum implementation. The study included 717 women, 337 prior to intervention and 380 after intervention. Women who delivered after curriculum implementation were more likely to breastfeed exclusively at 6 weeks postpartum (odds ratio

Effect of Commercial Cell-Free Fetal DNA Tests for Aneuploidy Screening on Rates of Invasive Testing

INTRODUCTION: The objective of this study was to determine the effect of new commercial tests for aneuploidy screening using cell-free fetal DNA on rates of invasive testing. METHODS: Commercial aneuploidy screening tests using cell-free fetal DNA were first offered at Lehigh Valley Health Network Maternal Fetal Medicine in late December 2011. All patients offered cell-free fetal DNA testing were at high risk for fetal aneuploidy defined as advanced maternal age, abnormal aneuploidy screening, abnormal ultrasound findings, personal or family history, or all of these. Data regarding cell-free fetal DNA test rates, invasive testing rates (amniocentesis and chorionic villus sampling), and indication for testing were collected. Invasive testing indications were further categorized into testing for aneuploidy or for other indications. χ was used to compare rates of invasive testing before and after introduction of cell-free fetal DNA testing. RESULTS: Three hundred sixty-five patients underwent cell-free fetal DNA testing from December 1, 2011 to December 30, 2012. The rates of invasive testing overall and invasive testing for aneuploidy both decreased significantly after introduction of cell-free fetal DNA testing as compared with before (P CONCLUSION: : The new commercial tests available for aneuploidy screening using cell-free fetal DNA were rapidly incorporated into clinical practice and are associated with decreased use of invasive tests

Impact of a Formal Lactation Curriculum for Residents on Breastfeeding Rates Among Low-Income Women.

Background: Due to lack of breastfeeding training, many physicians are unable to address basic breastfeeding needs. Previous studies have demonstrated that obstetrics-gynecology residents and practicing physicians do not have adequate training in lactation management. A formal breastfeeding curriculum has been shown to increase physician knowledge and improve breastfeeding rates in their patients. Objective: The goal of this study is to investigate the impact of a targeted lactation curriculum for obstetrics and gynecology residents on breastfeeding rates in a diverse low income popu- lation. Study design: A retrospective cohort study was performed at a community based, university affiliated hospital, one resi- dency program implemented the curriculum. Breastfeeding outcomes of women with a singleton live-born infant at term gestation were analyzed before and after implementation of curriculum. Detailed demographic information, medical his- tory, and breastfeeding rates were derived from hospital lac- tation record log and electronic medical records from the clinic and hospital where residents trained. The v2, independent- sample t tests and Mann Whitney U tests were used where appropriate. A multivariate logistic regression analysis was also performed. Results: The study included 717 women, 337 prior to inter- vention and 380 after intervention. The mean age was 25 years, most women were multiparous (64%), unemployed (61%), Hispanic (57%), married or in a stable relationship (76%). The women who delivered after institution of the curriculum were more likely to breastfeed exclusively at 6 weeks postpartum (OR: 1.96 [95% CI: 1.24-3.11]). Another factor significantly associ- ated with exclusive breastfeeding at 6 weeks was being in a stable relationship (