Anosmia and dysgeusia in SARS-CoV-2 infection: incidence and effects on COVID-19 severity and mortality, and the possible pathobiology mechanisms - a systematic review and meta-analysis

Background: The present study aimed to determine the global prevalence of anosmia and dysgeusia in coronavirus disease 2019 (COVID-19) patients and to assess their association with severity and mortality of COVID-19. Moreover, this study aimed to discuss the possible pathobiological mechanisms of anosmia and dysgeusia in COVID-19. Methods: Available articles from PubMed, Scopus, Web of Science, and preprint databases (MedRxiv, BioRxiv, and Researchsquare) were searched on November 10th, 2020. Data on the characteristics of the study (anosmia, dysgeusia, and COVID-19) were extracted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guideline. Newcastle–Ottawa scale was used to assess research quality. Moreover, the pooled prevalence of anosmia and dysgeusia were calculated, and the association between anosmia and dysgeusia in presence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was assessed using the Z test. Results: Out of 32,142 COVID-19 patients from 107 studies, anosmia was reported in 12,038 patients with a prevalence of 38.2% (95% CI: 36.5%, 47.2%); whereas, dysgeusia was reported in 11,337 patients out of 30,901 COVID-19 patients from 101 studies, with prevalence of 36.6% (95% CI: 35.2%, 45.2%), worldwide. Furthermore, the prevalence of anosmia was 10.2-fold higher (OR: 10.21; 95% CI: 6.53, 15.96, p < 0.001) and that of dysgeusia was 8.6-fold higher (OR: 8.61; 95% CI: 5.26, 14.11, p < 0.001) in COVID-19 patients compared to those with other respiratory infections or COVID-19 like illness. To date, no study has assessed the association of anosmia and dysgeusia with severity and mortality of COVID-19. Conclusion: Anosmia and dysgeusia are prevalent in COVID-19 patients compared to those with the other non-COVID-19 respiratory infections. Several possible mechanisms have been hypothesized; however, future studies are warranted to elucidate the definitive mechanisms of anosmia and dysgeusia in COVID-19. Protocol registration: PROSPERO CRD42020223204.

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Prevalence of Cognitive Impairment and Dementia in Older Adults Living at High Altitude: A Systematic Review and Meta-Analysis

Dementia and Geriatric Cognitive Disorders ◽

10.1159/000514471 ◽

2021 ◽

pp. 1-11

Author(s):

Diego Urrunaga-Pastor ◽

Diego Chambergo-Michilot ◽

Fernando M. Runzer-Colmenares ◽

Josmel Pacheco-Mendoza ◽

Vicente A. Benites-Zapata

Keyword(s):

Older Adults ◽

Cognitive Impairment ◽

High Altitude ◽

Web Of Science ◽

Meta Analysis ◽

Cross Sectional ◽

Language Restriction ◽

Newcastle Ottawa Scale ◽

Meta Analyses ◽

Ottawa Scale

Introduction: Dementia is a chronic disease with a variable prevalence throughout the world; however, this could be higher at high-altitude populations. We aimed to summarize the prevalence of cognitive impairment and dementia in older adults living at high altitude. Methods: We searched in PubMed, Medline, Scopus, Web of Science, and Embase and included the studies published from inception to July 20, 2020, with no language restriction, which reported the frequency of cognitive impairment or dementia in older adults living at high-altitude populations. Random-effects meta-analyses were performed to calculate the overall prevalence and 95% confidence intervals (95% CI) of cognitive impairment and dementia. The risk of bias was evaluated using the Newcastle-Ottawa Scale (NOS) adapted for cross-sectional studies. Results: Six studies were included (3,724 participants), and 5 of the 6 included studies were carried out in Latin America. The altitude ranged from 1,783 to 3,847 m, the proportion of women included varied from 38.7 to 65.6%, and the proportion of participants with elementary or illiterate educational level ranged from 71.7 to 97.6%. The overall prevalence of cognitive impairment was 22.0% (95% CI: 8–40, I2: 99%), and the overall prevalence of dementia was 11.0% (95% CI: 6–17, I2: 92%). In a subgroup analysis according to the instrument used to evaluate cognitive impairment, the prevalence of cognitive impairment was 21.0% (95% CI: 5–42, I2: 99%) in the MMSE group while the prevalence was 29.0% (95% CI: 0–78) in the non-MMSE group. Conclusions: The prevalence of cognitive impairment and dementia in older adults living at high altitude is almost twice the number reported in some world regions.

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Detection of Cytomegalovirus Infection in Infants with Biliary Atresia: A Meta-analysis

Avicenna Journal of Medicine ◽

10.1055/s-0041-1739236 ◽

2021 ◽

Author(s):

Sagad Omer Obeid Mohamed ◽

Almutasim B. E. Elhassan ◽

Ibrahim H. E. Elkhidir ◽

Almigdad H.M. Ali ◽

Mohamed Elata Hassan Elbathani ◽

...

Keyword(s):

Biliary Atresia ◽

Regional Differences ◽

Meta Analysis ◽

Autoimmune Response ◽

Cmv Infection ◽

Eligibility Criteria ◽

Pooled Prevalence ◽

Newcastle Ottawa Scale ◽

Meta Analyses ◽

Ottawa Scale

Abstract Objectives Biliary atresia (BA) is the most common indication of liver transplantation in children. Several reports attributed BA to both prenatal and perinatal etiologies, including a viral infection-induced autoimmune response that targets the bile ducts. Cytomegalovirus (CMV) remains the most common virus being linked to BA. This meta-analysis aimed to estimate to what extent CMV infection is detected in patients with BA. Methods This study was conducted according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. The databases of MEDLINE, Embase, Scopus, WHO-Virtual Health Library (VHL), ScienceDirect, and Google Scholar were used for the systematic search. The risk of bias was assessed using the Newcastle–Ottawa scale. Random effects model was used to estimate the pooled prevalence estimate with the corresponding 95% confidence interval (CI) using Comprehensive Meta-Analysis Software version 3.3. Results A total of 19 studies that fulfilled the eligibility criteria were included in the meta-analysis. The total number of infants with BA was 630 patients, and the pooled overall prevalence of CMV infection among them was 25.4% (95% CI: 15.9%–38.0%). There was high heterogeneity among studies (I2 = 85.1%, p < .001), and subgroup analyses showed significant regional differences (X2 = 48.9, p <.001). Data on the prognosis of CMV-associated BA were scarce and obtainable from few studies that suggested an association between detection of CMV infection and poor prognosis of BA. Conclusions The limited available data demonstrates that the rate of detection of CMV infection is high in infants with BA. There is still a need for large studies with appropriate controls for obtaining more reliable results about the various aspects of the association between CMV infection and BA.

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Mothers’ utilization and associated factors of preconception care in Africa, a systematic review and meta-analysis

PLoS ONE ◽

10.1371/journal.pone.0254935 ◽

2021 ◽

Vol 16 (7) ◽

pp. e0254935

Author(s):

Tiwabwork Tekalign ◽

Tesfanesh Lemma ◽

Mulualem Silesh ◽

Eyasu Alem Lake ◽

Mistire Teshome ◽

...

Keyword(s):

Associated Factors ◽

Preconception Care ◽

Medical Condition ◽

Meta Analysis ◽

Maternal Health Services ◽

Care Utilization ◽

Adverse Health Effects ◽

Pooled Prevalence ◽

Newcastle Ottawa Scale ◽

Meta Analyses

Background As the studies show, in every minute in the world, 380 women become pregnant and 190 face unplanned or unwanted pregnancies; 110 experience pregnancy-related complications, and one woman dies from a pregnancy-related cause. Preconception care is one of the proven strategies for the reduction in mortality and decreases the risk of adverse health effects for the woman, fetus, and neonate by optimizing maternal health services and improves woman’s health. Therefore, this study aimed to estimate the pooled prevalence of utilization of preconception of care and associated factors in Africa. Methods Systematic search of published studies done on PubMed, EMBASE, MEDLINE, Cochrane, Scopus, Web of Science CINAHL, and manually on Google Scholar. This meta-analysis follows the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. The quality of studies was assessed by the modified Newcastle-Ottawa Scale (NOS). Meta-analysis was carried out using a random-effects method using the STATA™ Version 14 software. Result From 249,301 obtained studies, 28 studies from 3 African regions involving 13067 women included in this Meta-analysis. The overall pooled prevalence of utilization of preconception care among pregnant women in Africa was found to be 18.72% (95% CI: 14.44, 23.00). Knowledge of preconception care (P = <0.001), preexisting medical condition (P = 0.045), and pregnancy intention (P = 0.016) were significantly associated with the utilization of preconception care. Conclusion The results of this meta-analysis indicated, as one of best approaches to improve birth outcomes, the utilization of preconception care is significantly low among mothers in Africa. Therefore, health care organizations should work on strategies to improve preconception care utilization.

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Diabetes as a risk factor for incident peripheral arterial disease in women compared to men: a systematic review and meta-analysis

Cardiovascular Diabetology ◽

10.1186/s12933-020-01130-4 ◽

2020 ◽

Vol 19 (1) ◽

Cited By ~ 1

Author(s):

Alyssa Z. Chase-Vilchez ◽

Isaac H. Y. Chan ◽

Sanne A. E. Peters ◽

Mark Woodward

Keyword(s):

Cardiovascular Disease ◽

Risk Factor ◽

Relative Risk ◽

Meta Analysis ◽

Arterial Disease ◽

Excess Risk ◽

Newcastle Ottawa Scale ◽

Peripheral Arterial ◽

Meta Analyses ◽

Ottawa Scale

Abstract Aims/hypothesis Previous meta-analyses have suggested that diabetes confers a greater excess risk of coronary heart disease, stroke, vascular dementia, and heart failure in women compared to men. While the underlying mechanism that explains such greater excess risk is unknown, in the current meta-analysis we hypothesized that we would find a similar sex difference in the relationship between diabetes and peripheral arterial disease (PAD). Methods PubMed MEDLINE, the Cochrane Database of Systematic Reviews, and Embase were systematically searched for prospective population-based cohort studies, with no restriction on publication date, language, or country. We included studies that reported the relative risk (RR), and its variability, for incident PAD associated with diabetes in both sexes. We excluded studies that did not adjust at least for age, and in which participants had pre-existing PAD. In cases where sex-specific results were not reported, study authors were contacted. Random-effects meta-analyses with inverse variance weighting were used to obtain summary sex-specific RRs and the women: men ratio of RRs for PAD. The Newcastle–Ottawa scale was used to assess study quality. Results Data from seven cohorts, totalling 2071,260 participants (49.8% women), were included. The relative risk for incident PAD associated with diabetes compared with no diabetes was 1.96 (95% CI 1.29–2.63) in women and 1.84 (95% CI 1.29–2.86) in men, after adjusting for potential confounders. The multiple-adjusted RR ratio was 1.05 (95% CI 0.90–1.22), with virtually no heterogeneity between studies (I2 = 0%). All studies scored 6–8, on the Newcastle–Ottawa scale of 0–9, indicating good quality. Eleven of the 12 studies that met review inclusion criteria did not report sex-specific relative risk, and these data were collected through direct correspondence with the study authors. Conclusion/interpretation Consistent with other studies, we found evidence that diabetes is an independent risk factor for PAD. However, in contrast to similar studies of other types of cardiovascular disease, we did not find evidence that diabetes confers a greater excess risk in women compared to men for PAD. More research is needed to explain this sex differential between PAD and other forms of CVD, in the sequelae of diabetes. In addition, we found that very few studies reported the sex-specific relative risk for the association between diabetes and PAD, adding to existing evidence for the need for improved reporting of sex-disaggregated results in cardiovascular disease research.

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Global prevalence and pathogenesis of headache in COVID-19: A systematic review and meta-analysis

F1000Research ◽

10.12688/f1000research.27334.1 ◽

2020 ◽

Vol 9 ◽

pp. 1316

Author(s):

Endang Mutiawati ◽

Syahrul Syahrul ◽

Marhami Fahriani ◽

Jonny Karunia Fajar ◽

Sukamto S. Mamada ◽

...

Keyword(s):

Systematic Review ◽

Web Of Science ◽

Viral Infections ◽

Meta Analysis ◽

Global Prevalence ◽

Newcastle Ottawa Scale ◽

Adults And Children ◽

Respiratory Viral Infections ◽

Cumulative Prevalence ◽

Ottawa Scale

Background: This study was conducted to determine the prevalence of headache in coronavirus disease 2019 (COVID-19) and to assess its association as a predictor for COVID-19. This study also aimed to discuss the possible pathogenesis of headache in COVID-19. Methods: Available articles from PubMed, Scopus, and Web of Science were searched as of September 2nd, 2020. Data on characteristics of the study, headache and COVID-19 were extracted following the PRISMA guidelines. Biases were assessed using the Newcastle-Ottawa scale. The cumulative prevalence of headache was calculated for the general population (i.e. adults and children). The pooled odd ratio (OR) with 95% confidence intervals (95%CI) was calculated using the Z test to assess the association between headache and the presence of COVID-19 cases. Results: We included 104,751 COVID-19 cases from 78 eligible studies to calculate the global prevalence of headache in COVID-19 and 17 studies were included to calculate the association of headache and COVID-19. The cumulative prevalence of headache in COVID-19 was 25.2% (26,464 out of 104,751 cases). Headache was found to be more prevalent, approximately by two-fold, in COVID-19 patients than in non-COVID-19 patients with symptoms of other respiratory viral infections, OR: 1.73; 95% CI: 1.94, 2.5 with p=0.04. Conclusion: Headache is common among COVID-19 patients and seems to be more common in COVID-19 patients compared to those with the non-COVID-19 viral infection. No definitive mechanisms on how headache emerges in COVID-19 patients but several possible hypotheses have been proposed. However, extensive studies are warranted to elucidate the mechanisms. PROSPERO registration: CRD42020210332 (28/09/2020)

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Impact of Muscle Mass on Survival in Patients with Sepsis: A Systematic Review and Meta-Analysis

Annals of Nutrition and Metabolism ◽

10.1159/000519642 ◽

2021 ◽

pp. 1-7

Author(s):

Jiajie Zhang ◽

Yicheng Huang ◽

Yingsha Chen ◽

Xiaomin Shen ◽

Hongying Pan ◽

...

Keyword(s):

Muscle Mass ◽

Web Of Science ◽

Meta Analysis ◽

Psoas Muscle ◽

Cochrane Library ◽

Conference Abstract ◽

Newcastle Ottawa Scale ◽

Included Article ◽

Ottawa Scale

Introduction: The aim of this study is to investigate the association between loss of muscle mass and prognosis of sepsis. Methods: Six databases, including PubMed, Embase, Cochrane Library, Web of Science, Scopus, and Ovid, were searched by the deadline of August 18, 2020. A meta-analysis was conducted on the collected data by means of a random-effects model. The quality of each included article was assessed according to the Newcastle-Ottawa Scale. Results: Out of 1,819 references, 6 articles and 1 conference abstract were included. Sepsis patients with a loss of muscle mass or sarcopenia had higher mortality (risk ratio [RR]: 1.94, 95% confidence intervals [CI]: 1.59–2.37; I-squared = 18.7%, p < 0.001). The RR of mortality within 30 days (RR: 2.31, 95% CI: 1.78–2.99, p < 0.001) was higher than that of mortality over 30 days. Loss of psoas muscle mass, as evaluated by CT, showed the highest RR of sepsis mortality. In addition, based on data on overall survival retrieved from 4 trials, the pooled hazard ratio (HR) for patients with a loss of muscle mass or sarcopenia was 3.04. Subgroup analysis showed that survival time was the main source of heterogeneity for the overall HR. Furthermore, the scanning areas of muscle mass in survival patients were 0.33 cm2/m2 higher than those measured in deceased patients. Conclusion: A loss of muscle mass, as evaluated by CT scan, was associated with a poor outcome in sepsis.

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Prevalence of grief disorders in bereaved families of cancer patients: A meta-analysis

Palliative Medicine ◽

10.1177/02692163211066747 ◽

2021 ◽

pp. 026921632110667

Author(s):

Christina Yeni Kustanti ◽

Hsin Chu ◽

Xiao Linda Kang ◽

Tsai-Wei Huang ◽

Hsiu-Ju Jen ◽

...

Keyword(s):

Web Of Science ◽

Meta Analysis ◽

Educational Levels ◽

Loved One ◽

Future Studies ◽

Effective Strategies ◽

Patients With Cancer ◽

Pooled Prevalence ◽

Cancer Caregiving

Background: Cancer caregiving is a distressing experience and loss of a loved one can lead to intense grief and other adverse effects. However, the prevalence of grief disorders among families associated with cancer-related deaths remains unknown. Aim: This study aimed to determine the prevalence of grief disorders among families of patients with cancer to better inform clinicians, researchers, and policymakers. Design: Meta-analysis, PROSPERO number CRD42020209392. Data sources: The databases of CINAHL, Embase, MEDLINE, PubMed, Scopus, PsycINFO, and Web of Science were comprehensively searched with no language restrictions. The quality of included studies was assessed with Hoy’s criteria. Results: Among the 3046 records screened, 19 studies were eligible for meta-analysis, with a total of 14,971 participants. The pooled prevalence rate of grief disorders was estimated at 14.2% (95% CI, 11.7%–16.7%), ranging from 7% to 39%. The prevalence was higher in females (10%; 95% CI, 8.2%–12.1%), those who are religious (9.55%; 95% CI, 8.97%–10.16%), spouses of the deceased (7.78%; 95% CI, 6.08%–9.69%), and families of patients with neurological cancers (6.4%; 95% CI, 0.10%–19.9%). Educational levels, study locations, diagnosis tools, time post-after loss, and study methods seemed not to affect the prevalence of grief disorders in families of patients with cancer. Conclusions: As the prevalence of grief disorders in cancer-related bereavement is substantial, therefore, support including palliative care is important to reduce the burden of caregiving. In addition, future studies are needed to identify and explore effective strategies that can help reduce the burden caused by grief disorders after the death of the patient.

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Gender differences in blindness, cataract blindness and cataract surgical coverage in India: a systematic review and meta-analysis

British Journal of Ophthalmology ◽

10.1136/bjophthalmol-2018-313562 ◽

2019 ◽

Vol 104 (2) ◽

pp. 220-224 ◽

Cited By ~ 4

Author(s):

Manya Prasad ◽

Sumit Malhotra ◽

Mani Kalaivani ◽

Praveen Vashist ◽

Sanjeev K Gupta

Keyword(s):

Systematic Review ◽

Gender Differences ◽

Literature Search ◽

Web Of Science ◽

Meta Analysis ◽

Risk Of Bias ◽

Gender Differentials ◽

Indian Context ◽

Pooled Prevalence ◽

Meta Analyses

BackgroundThe magnitude of blindness is unevenly distributed worldwide. This systematic review aimed to study gender differences in the prevalence of blindness, cataract blindness and cataract surgical coverage in India among persons aged 50 years and above.MethodsLiterature search was carried out in the Medline, Web of Science, Google Scholar, EMBASE and Trip databases. Data were abstracted and risk of bias was assessed for the selected full-text articles. Pooled prevalence, ORs and risk differences were synthesised by meta-analyses.Results22 studies were included in the systematic review. The pooled prevalence of blindness obtained for men was 4.17% and that for women was 5.68%. Women had 35% higher odds of being blind (OR 1.35, 95% CI 1.08 to 1.62) and 69% higher odds of being cataract blind (OR 1.69, 95% CI 1.44 to 1.95). Women had a 27% lower odds of getting cataract surgery (OR 0.73, 95% CI 0.45 to 1.01). In women, around 35% of the prevalence of blindness and 33% of the prevalence of cataract blindness are attributable to their gender.ConclusionMarked gender differences in blindness, cataract blindness and cataract surgical coverage were seen in India, with the odds being unfavourable for women. Interventions implemented for reduction of blindness, including cataract blindness, need to consider these gender differentials in the Indian context. Further research is needed to ascertain the reasons for these differences and devise interventions to reduce these differences in order to tackle the magnitude of avoidable blindness in India.

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Incidence and prevalence of systemic sclerosis globally: a comprehensive systematic review and meta-analysis

Rheumatology ◽

10.1093/rheumatology/keab190 ◽

2021 ◽

Author(s):

Majd Bairkdar ◽

Marios Rossides ◽

Helga Westerlind ◽

Roger Hesselstrand ◽

Elizabeth V Arkema ◽

...

Keyword(s):

Systematic Review ◽

Web Of Science ◽

Meta Analysis ◽

Case Definition ◽

Random Effects Models ◽

Pooled Prevalence ◽

Prisma Statement ◽

The World ◽

Large Heterogeneity ◽

Meta Analyses

Abstract Objectives We aimed to conduct a systematic review and meta-analysis on the incidence and prevalence of SSc covering the entire literature. Methods This study followed the recommendations of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement of 2009. We conducted a systematic search in MEDLINE, Web of Science and Embase to identify articles reporting incidence and/or prevalence of SSc. Two authors conducted the search, reviewed articles for inclusion and extracted relevant data. We used random-effects models to estimate the pooled prevalence and incidence of SSc and performed subgroup analyses by sex, case definition and region to investigate heterogeneity. We explored the association between calendar period and reported estimates using meta-regression. Results Among 6983 unique records identified, we included 61 studies of prevalence and 39 studies of incidence in the systematic review. The overall pooled prevalence of SSc was 17.6 (95% CI 15.1, 20.5) per 100 000 and the overall pooled incidence rate of SSc was 1.4 (95% CI 1.1, 1.9) per 100 000 person-years. We observed significant regional variations in reported estimates; studies conducted in North America reported considerably higher estimates than other regions. The pooled incidence and prevalence in women were five times higher than in men. More recent studies reported higher estimates than older ones. Conclusion In this comprehensive review of the incidence and prevalence of SSc across the world, there was large heterogeneity among estimates, which should be taken into consideration when interpreting the results.

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The Impact of Segmentectomy Versus Lobectomy on Pulmonary Function in Patients With Non-small-cell Lung Cancer: a Meta-analysis

10.21203/rs.3.rs-1048811/v1 ◽

2021 ◽

Author(s):

Yuan Xu ◽

Yingzhi Qin ◽

Dongjie Ma ◽

Hongsheng Liu

Keyword(s):

Pulmonary Function ◽

Web Of Science ◽

Meta Analysis ◽

Postoperative Changes ◽

Newcastle Ottawa Scale ◽

Stage Ia ◽

Nsclc Patients ◽

The Impact ◽

Ottawa Scale

Abstract Objective: Segmentectomy has been reported as an alternative to lobectomy for small-sized NSCLC without detriment to survival. The long-term benefits of segmentectomy over lobectomy on pulmonary function have not been firmly established. This meta-analysis aims to compare postoperative changes in pulmonary function in NSCLC patients undergoing segmentectomy or lobectomy.Methods: Medline, Embase, Web of Science and Scopus were searched through March 2021. Statistical comparisons were made when appropriate.Results: Fourteen studies (2412 participants) out of 324 citations were included in this study. All selected studies were high quality, as indicated by the Newcastle–Ottawa scale for assessing the risk of bias. Clinical outcomes were compared between segmentectomy and lobectomy. ΔFEV1 [10 studies, P<0.01, WMD = 0.40 (0.29, 0.51)], ΔFVC [4 studies, P<0.01, WMD = 0.16 (0.07, 0.24)], ΔFVC% [4 studies, P<0.01, WMD = 4.05 (2.32, 5.79)], ΔFEV1/FVC [2 studies, P<0.01, WMD = 1.99 (0.90, 3.08)], and ΔDLCO [3 studies, P<0.01, WMD = 1.30 (0.69, 1.90)] were significantly lower in the segmentectomy group than in the lobectomy group. Subgroup analysis showed that in stage IA patients, the ΔFEV1% [3 studies, P<0.01, WMD = 0.26 (0.07, 0.46)] was significantly lower in the segmentectomy group. The ΔDLCO% and ΔMVV% were incomparable.Conclusion: Segmentectomy preserves more lung function than lobectomy. There were significantly smaller decreases in FEV1, FVC, FVC%, FEV1/FVC and DLCO in the segmentectomy group than in the lobectomy group.

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