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Hilland GH, Anthun KS. Socioeconomic determinants of myalgic encephalomyelitis/chronic fatigue syndrome in Norway: a registry study. BMC Public Health 2024; 24:1296. [PMID: 38741074 DOI: 10.1186/s12889-024-18757-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 05/02/2024] [Indexed: 05/16/2024] Open
Abstract
BACKGROUND Previous research has shown that socioeconomic status (SES) is a strong predictor of chronic disease. However, to the best of our knowledge, there has been no studies of how SES affects the risk of Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) that has not been based upon self-reporting or retrospectively screening of symptoms. As far as we know, this is therefore the first study that isolate and describe socioeconomic determinants of ME/CFS and calculate how these factors relate to the risk of ME/CFS diagnosis by utilizing individual level registry data. This allows for objective operationalization of the ME/CFS population, and makes it possible to model SES affect the risk of ME/CFS diagnosis, relative to control groups. DATA AND METHODS We conduct a pooled cross-sectional analysis of registry data from all adult patients diagnosed with ME/CFS from 2016 to 2018 in Norway, coupled with socioeconomic data from statistics Norway from 2011 to 2018. We operationalize SES as household income and educational attainment fixed at the beginning of the study period. We compare the effects of SES on the risk of ME/CFS diagnosis to a population of chronically ill patients with hospital diagnoses that share clinical characteristics of ME/CFS and a healthy random sample of the Norwegian population. Our models are estimated by logistic regression analyses. RESULTS When comparing the risk of ME/CFS diagnosis with a population consisting of people with four specific chronic diseases, we find that high educational attainment is associated with a 19% increase (OR: 1.19) in the risk of ME/CFS and that high household income is associated with a 17% decrease (OR:0.83) in risk of ME/CFS. In our second model we compare with a healthy population sample, and found that low educational attainment is associated with 69% decrease (OR:0.31) in the risk of ME/CFS and that low household income is associated with a 53% increase (OR: 1.53). CONCLUSION We find statistically significant associations between SES and the risk of ME/CFS. However, our more detailed analyses shows that our findings vary according to which population we compare the ME/CFS patients with, and that the effect of SES is larger when comparing with a healthy population sample, as opposed to controls with selected hospital diagnoses.
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Affiliation(s)
- Geir Haakon Hilland
- SINTEF Digital, Department of Health, Health services research group, Strindvegen 4, Trondheim, 7034, Norway
| | - Kjartan Sarheim Anthun
- SINTEF Digital, Department of Health, Health services research group, Strindvegen 4, Trondheim, 7034, Norway.
- Department of Public Health and Nursing, Norwegian University of Science and Technology, Håkon Jarlsgate 11, Trondheim, 7030, Norway.
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Dreyfus J, Munnangi S, Bengtsson C, Correia B, Figueiredo R, Stark JH, Zawora M, Riddle MS, Maguire JD, Jiang Q, Ianos C, Naredo Turrado J, Svanström H, Bailey S, DeKoven M. Background incidence rates of health outcomes in populations at risk for Lyme disease using US administrative claims data. Vaccine 2024; 42:1094-1107. [PMID: 38262807 DOI: 10.1016/j.vaccine.2024.01.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 01/09/2024] [Accepted: 01/12/2024] [Indexed: 01/25/2024]
Abstract
BACKGROUND Background incidence rates (IRs) of health outcomes in Lyme disease endemic regions are useful to contextualize events reported during Lyme disease vaccine clinical trials or post-marketing. The objective of this study was to estimate and compare IRs of health outcomes in Lyme disease endemic versus non-endemic regions in the US during pre-COVID and COVID era timeframes. METHODS IQVIA PharMetrics® Plus commercial claims database was used to estimate IRs of 64 outcomes relevant to vaccine safety monitoring in the US during January 1, 2017-December 31, 2019 and January 1, 2020-December 31, 2021. Analyses included all individuals aged ≥ 2 years with ≥ 1 year of continuous enrollment. Outcomes were defined by International Classification of Diseases Clinical Modification, 10th Revision (ICD-10-CM) diagnosis codes. IRs and 95 % confidence intervals (CIs) were calculated for each outcome and compared between endemic vs. non-endemic regions, and pre-COVID vs. COVID era using IR ratios (IRR). RESULTS The study population included 8.7 million (M) in endemic and 27.8 M in non-endemic regions. Mean age and sex were similar in endemic and non-endemic regions. In both study periods, the IRs were statistically higher in endemic regions for anaphylaxis, meningoencephalitis, myocarditis/pericarditis, and rash (including erythema migrans) as compared with non-endemic regions. Conversely, significantly lower IRs were observed in endemic regions for acute kidney injury, disseminated intravascular coagulation, heart failure, myelitis, myopathies, and systemic lupus erythematosus in both study periods. Most outcomes were statistically less frequent during the COVID-era. CONCLUSION This study identified potential differences between Lyme endemic and non-endemic regions of the US in background IRs of health conditions during pre-COVID and COVID era timeframes to inform Lyme disease vaccine safety monitoring. These regional and temporal differences in background IRs should be considered when contextualizing possible safety signals in clinical trials and post-marketing of a vaccine targeted at Lyme disease prevention.
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Affiliation(s)
| | | | | | | | | | - James H Stark
- Vaccines, Antivirals, and Evidence Generation, Medical Affairs, Pfizer Biopharma Group, Cambridge, MA, USA
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Çelik A, Çöllüoğlu İT, Şahin A, Ural D, Yılmaz MB, Ata N. Why has the incidence of heart failure decreased by half in Türkiye?-Authors' reply. THE LANCET REGIONAL HEALTH. EUROPE 2023; 35:100762. [PMID: 37954221 PMCID: PMC10632534 DOI: 10.1016/j.lanepe.2023.100762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Accepted: 10/11/2023] [Indexed: 11/14/2023]
Affiliation(s)
- Ahmet Çelik
- Department of Cardiology, Mersin University, Faculty of Medicine, Mersin, Türkiye
| | - İnci Tuğçe Çöllüoğlu
- Department of Cardiology, Karabük University, Faculty of Medicine, Karabük, Türkiye
| | - Anıl Şahin
- Department of Cardiology, Sivas Cumhuriyet University, Faculty of Medicine, Sivas, Türkiye
| | - Dilek Ural
- Department of Cardiology, Koç University, Faculty of Medicine, Istanbul, Türkiye
| | - Mehmet Birhan Yılmaz
- Department of Cardiology, Dokuz Eylül University, Faculty of Medicine, Izmir, Türkiye
| | - Naim Ata
- General Directorate of Information Systems, Ministry of Health, Ankara, Türkiye
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Yang W, Wang B, Ma S, Wang J, Ai L, Li Z, Wan X. Optimal Look-Back Period to Identify True Incident Cases of Diabetes in Medical Insurance Data in the Chinese Population: Retrospective Analysis Study. JMIR Public Health Surveill 2023; 9:e46708. [PMID: 37930785 PMCID: PMC10660214 DOI: 10.2196/46708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 08/23/2023] [Accepted: 09/26/2023] [Indexed: 11/07/2023] Open
Abstract
BACKGROUND Accurate estimation of incidence and prevalence is vital for preventing and controlling diabetes. Administrative data (including insurance data) could be a good source to estimate the incidence of diabetes. However, how to determine the look-back period (LP) to remove cases with preceding records remains a problem for administrative data. A short LP will cause overestimation of incidence, whereas a long LP will limit the usefulness of a database. Therefore, it is necessary to determine the optimal LP length for identifying incident cases in administrative data. OBJECTIVE This study aims to offer different methods to identify the optimal LP for diabetes by using medical insurance data from the Chinese population with reference to other diseases in the administrative data. METHODS Data from the insurance database of the city of Weifang, China from between January 2016 and December 2020 were used. To identify the incident cases in 2020, we removed prevalent patients with preceding records of diabetes between 2016 and 2019 (ie, a 4-year LP). Using this 4-year LP as a reference, consistency examination indexes (CEIs), including positive predictive values, the κ coefficient, and overestimation rate, were calculated to determine the level of agreement between different LPs and an LP of 4 years (the longest LP). Moreover, we constructed a retrograde survival function, in which survival (ie, incident cases) means not having a preceding record at the given time and the survival time is the difference between the date of the last record in 2020 and the most recent previous record in the LP. Based on the survival outcome and survival time, we established the survival function and survival hazard function. When the survival probability, S(t), remains stable, and survival hazard converges to zero, we obtain the optimal LP. Combined with the results of these two methods, we determined the optimal LP for Chinese diabetes patients. RESULTS The κ agreement was excellent (0.950), with a high positive predictive value (92.2%) and a low overestimation rate (8.4%) after a 2-year LP. As for the retrograde survival function, S(t) dropped rapidly during the first 1-year LP (from 1.00 to 0.11). At a 417-day LP, the hazard function reached approximately zero (ht=0.000459), S(t) remained at 0.10, and at 480 days, the frequency of S(t) did not increase. Combining the two methods, we found that the optimal LP is 2 years for Chinese diabetes patients. CONCLUSIONS The retrograde survival method and CEIs both showed effectiveness. A 2-year LP should be considered when identifying incident cases of diabetes using insurance data in the Chinese population.
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Affiliation(s)
- Wenyi Yang
- Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
- School of Basic Medicine, Peking Union Medical College, Beijing, China
| | - Baohua Wang
- Chinese Center for Disease Control and Prevention, National Institute for Prevention and Control of Chronic Noncommunicable Diseases, Beijing, China
| | - Shaobo Ma
- Weifang Medical Insurance Center, Weifang, China
| | - Jingxin Wang
- Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
- School of Basic Medicine, Peking Union Medical College, Beijing, China
| | - Limei Ai
- Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
- School of Basic Medicine, Peking Union Medical College, Beijing, China
| | - Zhengyu Li
- Department of Clinical Medicine, Qingdao University Medical College, Qingdao, China
| | - Xia Wan
- Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
- School of Basic Medicine, Peking Union Medical College, Beijing, China
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Kendzerska T, Povitz M, Gershon AS, Ryan CM, Talarico R, Franco Avecilla DA, Robillard R, Ayas NT, Pendharkar SR. Association of clinically significant obstructive sleep apnoea with risks of contracting COVID-19 and serious COVID-19 complications: a retrospective population-based study of health administrative data. Thorax 2023; 78:933-941. [PMID: 36717242 DOI: 10.1136/thorax-2022-219574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 01/03/2023] [Indexed: 02/01/2023]
Abstract
RATIONALE/OBJECTIVES Despite plausible pathophysiological mechanisms, more research is needed to confirm the relationship between obstructive sleep apnoea (OSA) and the risk of COVID-19 infection or COVID-19-related serious complications. METHODS We conducted a retrospective population-based cohort study using provincial health administrative data (Ontario, Canada). Adults with physician-diagnosed OSA who received positive airway pressure therapy in the 5 years prepandemic (OSA group) were propensity score matched by baseline characteristics to individuals in the general population at low risk of OSA (non-OSA group) using inverse probability of treatment weighting. Weighted HRs of (1) a positive COVID-19 test and (2) COVID-19-related emergency department (ED) visits, hospitalisations, intensive care unit (ICU) admissions and mortality, within 12 months of pandemic onset, were compared between groups. We also evaluated the impact of comorbid cardiometabolic or chronic airways disease. RESULTS We identified and matched 324 029 individuals in the OSA group to 4 588 200 individuals in the non-OSA group. Compared with the non-OSA group, those in the OSA group were at a greater hazard of testing positive for COVID-19 (HR=1.17, 95% CI 1.13 to 1.21), having a COVID-19-related ED visit (HR=1.62, 95% CI 1.51 to 1.73), hospitalisation (HR=1.50, 95% CI 1.37 to 1.65) or ICU admission (HR=1.53, 95% CI 1.27 to 1.84). COVID-19-related 30-day mortality was not different (HR=0.98, 95% CI 0.82 to 1.16).We found that for the OSA group, comorbid airways disease but not cardiometabolic conditions increased the hazards of COVID-19-related outcomes, including mortality. CONCLUSION In this large population-based study, we demonstrated that a recent diagnosis of OSA requiring treatment was associated with an increased hazard of testing positive for COVID-19 and serious COVID-19-related complications, particularly in those with co-existing chronic airways disease.
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Affiliation(s)
- Tetyana Kendzerska
- Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
- ICES, Ottawa, Ontario, Canada
- Department of Medicine, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Marcus Povitz
- Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Andrea S Gershon
- ICES, Toronto, Ontario, Canada
- Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
- Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Clodagh M Ryan
- Department of Medicine, University of Toronto, Toronto, Ontario, Canada
- Sleep Research Laboratory, Toronto Rehabilitation Institute University Health Network, Toronto, Ontario, Canada
| | - Robert Talarico
- Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
- ICES, Ottawa, Ontario, Canada
| | | | | | - Najib T Ayas
- Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Sachin R Pendharkar
- Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
- Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
- O'Brien Institute for Public Health, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
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Hoffmann M, Støvring H. Incidence in pharmacoepidemiology-Basic definitions and types of misclassification. Basic Clin Pharmacol Toxicol 2022; 130:632-643. [PMID: 35357769 PMCID: PMC9320840 DOI: 10.1111/bcpt.13727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 02/28/2022] [Accepted: 03/28/2022] [Indexed: 12/01/2022]
Abstract
The definition of a new case is a vital step in incidence studies in both epidemiology and pharmacoepidemiology, although with significant differences in methodology between the fields. We define and apply a framework for two different types of new cases of drug use, first-ever and recurrent, and show how the associated misclassifications related to length of run-in period can be expressed by the positive predictive value (PPV). In the study, we consider individual-level dispensations of statins 2006-2019 for 1,017,058 individuals with at least one dispensation in 2019 in Sweden. The incidence proportion for statins for both sexes of all ages in Sweden 2019 varied from 17.4/1000 with a run-in of 8 months, 9.45/1000 with 5 years and 8.4/1000 with 10 years. The PPV was 49% with 8 months and 89% for 5 years using 10 years as gold standard. We conclude that the interpretation of incidence and thus the selection of an appropriate run-in period, in pharmacoepidemiology, depends on whether first-ever use, recurrent treatment or both together (new cases) is the focus of the research question studied. At least five different misclassifications can be introduced depending on how incidence is defined.
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Affiliation(s)
- Mikael Hoffmann
- Health Care Analysis, Division of Society and HealthLinköping University, Sweden & The NEPI FoundationStockholmSweden
| | - Henrik Støvring
- Clinical Pharmacology, Pharmacy and Environmental MedicineUniversity of Southern DenmarkOdenseDenmark
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Ødegaard KM, Lirhus SS, Melberg HO, Hallén J, Halvorsen S. A nationwide registry study on heart failure in Norway from 2008 to 2018: variations in lookback period affect incidence estimates. BMC Cardiovasc Disord 2022; 22:88. [PMID: 35247979 PMCID: PMC8898410 DOI: 10.1186/s12872-022-02522-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 02/21/2022] [Indexed: 12/20/2022] Open
Abstract
Background The incidence of heart failure (HF) has declined in Europe during the past two decades. However, incidence estimates from registry-based studies may vary, partly because they depend on retrospective searches to exclude previous events. The aim of this study was to assess to what extent different lookback periods (LPs) affect temporal trends in incidence, and to identify the minimal acceptable LP. Further, we wanted to estimate temporal trends in incidence and prevalence of HF in a nationwide population, using the minimal acceptable LP.
Methods We identified all in- and out-patient contacts for HF in Norway during 2008 to 2018 from the Norwegian Patient Registry. To calculate the influence of varying LP on incident cases, we defined 2018 with 10 years of LP as a reference and calculated the relative difference by using one through 9 years of lookback. Temporal trends in incidence rates were estimated with sensitivity analyses applying varying LPs and different case definitions. Standardised incidence rates and prevalence were calculated by applying direct age- and sex-standardization to the 2013 European Standard Population. Results The overestimation of incident cases declined with increasing number of years included in the LP. Compared to a 10-year LP, application of 4, 6, and 8 years resulted in an overestimation of incident cases by 13.5%, 6.2% and 2.3%, respectively. Temporal trends in incidence were affected by the number of years in the LP and whether the LP was fixed or varied. Including all available data mislead to conclusions of declining incidence rates over time due to increasing LPs. Conclusions When taking the number of years with available data and HF mortality and morbidity into consideration, we propose that 6 years of fixed lookback is sufficient for identification of incident HF cases. HF incidence rates and prevalence increased from 2014 to 2018. Trial registration Retrospectively registered. Supplementary Information The online version contains supplementary material available at 10.1186/s12872-022-02522-y.
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