scholarly journals A Case Control Study Comparing Risk Factors for Ectopic Gestation in Unusual and Tubal Gestations

2013 ◽  
Vol 4 (1) ◽  
pp. 14-17
Author(s):  
Lakshmi Rathna Marakani ◽  
Sirisha Rao Gundabattula ◽  
Shashikala Dasari ◽  
Manjula Pochiraju ◽  
Kameswari Surampudi
Keyword(s):  
Risk Factors ◽  
Maternal Age ◽  
Case Control Study ◽  
Uterine Cavity ◽  
Advanced Maternal Age ◽  
Case Control ◽  
Ectopic Gestation ◽  
Beta Hcg ◽  
Increased Risk ◽  
Control Study

ABSTRACT Aim To compare risk factors for extratubal gestations with tubal gestations. Materials and methods Case control design with retrospective examination of an electronic database to identify ectopic gestations. Ectopic gestations were confirmed through ultrasound examination or serum beta hCG levels. We defined an ectopic gestation as implantation of pregnancy outside uterine cavity; tubal ectopic including implantation in the tube, isthmic, ampullary, or fimbrial and extratubal ectopic including implantation in the ovaries, cervix, abdomen, interstitia or cesarean scar. Results Ninety-one (1.1%, 95% CI: 0.9-1.3, 1 in 90 pregnancies) of 8,203 pregnancies during the study period were ectopic gestations including 69 (0.8%, 95% CI: 0.7-1.1, 1 in 120 pregnancies) tubal gestations and 22 (0.3%, 95% CI: 0.2-0.4, 1 in 372 pregnancies) gestations in extratubal locations. Extratubal ectopic gestations were more common in women with advanced maternal age (odds ratio: 7.4, 95% CI: 1.3, 43.9, p = 0.03) compared to women with tubal ectopic gestations. Conclusion Risk factors for extratubal gestation did not differ from risk factors for tubal gestations except for advanced maternal age. Pregnant women with advanced maternal age have to be additionally counseled on the increased risk for extratubal gestations. How to cite this article Pochiraju M, Surampudi K, Marakani LR, Dasari S, Gundabattula SR. A Case Control Study Comparing Risk Factors for Ectopic Gestation in Unusual and Tubal Gestations. Int J Infertility Fetal Med 2013;4(1):14-17.

scholarly journals Neonatal and Maternal Complications of Placenta Praevia and Its Risk Factors in Tikur Anbessa Specialized and Gandhi Memorial Hospitals: Unmatched Case-Control Study

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Ashete Adere ◽  
Abay Mulu ◽  
Fikremelekot Temesgen
Keyword(s):  
Risk Factors ◽  
Caesarean Section ◽  
Blood Transfusion ◽  
Maternal Age ◽  
Case Control Study ◽  
Advanced Maternal Age ◽  
Case Control ◽  
Placenta Praevia ◽  
Maternal Complications ◽  
Control Study

Background. Placenta praevia is a disorder that happens during pregnancy when the placenta is abnormally placed in the lower uterine segment, which at times covers the cervix. The incidence of placenta praevia is 3-5 per 1000 pregnancies worldwide and is still rising because of increasing caesarean section rates. Objective. To assess and identify the risk factors and maternal and neonatal complications associated with placenta praevia. Method and Materials. Target populations for this study were all women diagnosed with placenta praevia transvaginally or transabdominally either during the second and third trimesters of pregnancy or intraoperatively in Tikur Anbessa Specialized and Gandhi Memorial Hospitals. The study design was unmatched case-control study. Data was carefully extracted from medical records, reviewed, and analyzed. Unconditional logistic regression analysis was performed using adjusted odds ratios (AOR) with 95% confidence intervals. Results. Pregnancies complicated by placenta praevia were 303. Six neonatal deaths were recorded in this study. The magnitude of placenta praevia observed was 0.7%. Advanced maternal age (≥35) (AOR 6.3; 95% CI: 3.20, 12.51), multiparity (AOR 2.2; 95% CI: 1.46, 3.46), and previous history of caesarean section (AOR 2.7; 95% CI: 1.64, 4.58) had an increased odds of placenta praevia. Postpartum anemia (AOR 14.6; 95% CI: 6.48, 32.87) and blood transfusion 1-3 units (AOR 2.7; 95% CI: 1.10, 6.53) were major maternal complications associated with placenta praevia. Neonates born to women with placenta praevia were at increased risk of respiratory syndrome (AOR 4; 95% CI: 1.24, 13.85), IUGR (AOR 6.3; 95% CI: 1.79, 22.38), and preterm birth (AOR 8; 95% CI: 4.91, 12.90). Conclusion. Advanced maternal age, multiparity, and previous histories of caesarean section were significantly associated risk factors of placenta praevia. Adverse maternal outcomes associated with placenta praevia were postpartum anemia and the need for blood transfusion. Neonates born from placenta praevia women were also at risk of being born preterm, intrauterine growth restriction, and respiratory distress syndrome.

scholarly journals Determinants of placenta previa: a case-control study

2017 ◽  
Vol 4 (06) ◽  
pp. 1411
Author(s):  
Fatemeh Shobeiri ◽  
Ensiyeh Jenabi ◽  
Manoochehr Karami ◽  
Simin Karimi
Keyword(s):  
Risk Factors ◽  
Preterm Labor ◽  
Maternal Age ◽  
Case Control Study ◽  
Placenta Previa ◽  
Significant Risk ◽  
Uterine Cavity ◽  
Case Control ◽  
Cesarean Sections ◽  
Control Study

Background: The risk factors of placenta previa differ around the world. This study evaluated risk factors of pregnancies complicated with placenta previa during a 5-year period in a referral center in Hamadan, Iran. Methods: This case control study was conducted in Hamadan city (Hamadan Province of Iran) from April 2013 to March 2017. The cases were women whose deliveries were complicated by placenta previa and the controls were those who delivered without placenta previa. We recruited 130 cases and 130 controls. Multivariate unconditional logistic regression analysis was conducted, and odds ratios (ORs) and 95% confidence intervals (CIs) were calculated. Results: The OR of placenta previa was 4.08 (95% CI= 1.44, 11.58) by maternal age, 4.08 (95% CI =1.44, 11.58) by preterm labor, and 6.64 (95% CI =1.09, 40.45) by prior operations of the uterine cavity, compared to normal deliveries and after adjusting for other variables. Multiparity, prior spontaneous abortions, and prior cesarean sections were not statistically significant risk factors for placenta previa, when adjusted for other variables.  Conclusion: Our study suggests that high maternal age and prior operations of the uterine cavity are risk factors for placenta previa.

scholarly journals 745 Risk Factors of Incident Renal Stones in Indian Population: A Hospital-Based Case-Control Study

2021 ◽  
Vol 108 (Supplement_2) ◽  
Author(s):  
S Singh ◽  
S Gupta ◽  
T S Mishra ◽  
B D Banerjee ◽  
T Sharma ◽  
...  
Keyword(s):  
Risk Factors ◽  
Heavy Metals ◽  
Case Control Study ◽  
Dietary Habits ◽  
Renal Stones ◽  
Tertiary Hospital ◽  
Case Control ◽  
The Body ◽  
Increased Risk ◽  
Control Study

Abstract Introduction Nephrolithiasis is pathological calcification in the excretory passages of the body and is prevalent among 7.6% of Indians. We aimed to study the various risk factors associated with renal stones from India. Method It was a hospital-based case-control study conducted over 18 months in a tertiary hospital in Delhi. Cases were defined as patients with renal stones diagnosed on the basis of history and radiological examination. Controls were similar to cases in all respects except for the diagnosis and selected from the hospital. A total of 18 risk factors, including age, gender, heavy metals, stress, metabolic factors, alcohol intake, dietary habits, co-morbidities, etc. were assessed. Logistic regression analysis was performed to calculate the strength of the risk associations. Results In the analysis of 60 cases and controls, we found 6 times, 5.5 times, and 2.4 times increased odds of renal stones in patients with increased arsenic, cadmium, and lead concentrations in blood, respectively. Similarly, there are 3 times increased odds of renal stones in patients suffering from stress. Conclusions Exposure to smoke, occupation dust, and contaminated water may lead to an increased ingestion/inhalation of heavy metals like cadmium, arsenic, and predisposing people to an increased risk of renal stones.

Risk factors and outcomes of postoperative emergency response team activation: a matched case-control study

2020 ◽  
Vol 22 (1) ◽  
pp. 6-14
Author(s):  
Matthew I Hardman ◽  
◽  
S Chandralekha Kruthiventi ◽  
Michelle R Schmugge ◽  
Alexandre N Cavalcante ◽  
...  
Keyword(s):  
Risk Factors ◽  
Logistic Regression ◽  
Postoperative Complications ◽  
Emergency Response ◽  
Case Control Study ◽  
Case Control ◽  
Multiple Logistic Regression ◽  
Increased Risk ◽  
Response Team ◽  
Control Study

OBJECTIVE: To determine patient and perioperative characteristics associated with unexpected postoperative clinical deterioration as determined for the need of a postoperative emergency response team (ERT) activation. DESIGN: Retrospective case–control study. SETTING: Tertiary academic hospital. PARTICIPANTS: Patients who underwent general anaesthesia discharged to regular wards between 1 January 2013 and 31 December 2015 and required ERT activation within 48 postoperative hours. Controls were matched based on age, sex and procedure. MAIN OUTCOME MEASURES: Baseline patient and perioperative characteristics were abstracted to develop a multiple logistic regression model to assess for potential associations for increased risk for postoperative ERT. RESULTS: Among 105 345 patients, 797 had ERT calls, with a rate of 7.6 (95% CI, 7.1–8.1) calls per 1000 anaesthetics (0.76%). Multiple logistic regression analysis showed the following risk factors for postoperative ERT: cardiovascular disease (odds ratio [OR], 1.61; 95% CI, 1.18–2.18), neurological disease (OR, 1.57; 95% CI, 1.11–2.22), preoperative gabapentin (OR, 1.60; 95% CI, 1.17–2.20), longer surgical duration (OR, 1.06; 95% CI, 1.02–1.11, per 30 min), emergency procedure (OR, 1.54; 95% CI, 1.09–2.18), and intraoperative use of colloids (OR, 1.50; 95% CI, 1.17–1.92). Compared with control participants, ERT patients had a longer hospital stay, a higher rate of admissions to critical care (55.5%), increased postoperative complications, and a higher 30-day mortality rate (OR, 3.36; 95% CI, 1.73–6.54). CONCLUSION: We identified several patient and procedural characteristics associated with increased likelihood of postoperative ERT activation. ERT intervention is a marker for increased rates of postoperative complications and death.

Waterpipe Tobacco Smoking and Other Multiple Sclerosis Environmental Risk Factors

2021 ◽  
Author(s):  
Nuha M. Alkhawajah ◽  
Salman Aljarallah ◽  
Laith Hussain-Alkhateeb ◽  
Mohammad Osama Almohaini ◽  
Taim A. Muayqil
Keyword(s):  
Risk Factors ◽  
Multiple Sclerosis ◽  
Tobacco Smoking ◽  
Case Control Study ◽  
Coffee Consumption ◽  
Case Control ◽  
Processed Meat ◽  
Increased Risk ◽  
Waterpipe Tobacco Smoking ◽  
Control Study

Abstract Introduction There are a number of well-established risk factors for multiple sclerosis (MS). Other factors however, showed conflicting or non-consistent results. Here we examine some factors that are unique to or more practiced in Saudi Arabia (SA) and the Arab region such as waterpipe tobacco smoking (WTS), face veiling, raw milk (RM), and camel milk (CM) consumption, tuberculosis (TB) infection in addition to other traditional factors. Methods This is a sex and age matched case-control study in which we used a structured questionnaire to examine the relation between a number of factors and exposures and the risk of MS. Three hundred MS patients and 601 controls were included. Data was analyzed across different statistical models using logistic regression adjusting for age, sex, marital status, duration of breastfeeding, age first joining school, coffee consumption, and face exposure. Results Cigarette smoking [OR = 1.79, (95% CI 1.01-3.17), P =0.047)], WTS [OR = 2.25, (95% CI 1.21-4.15), P =0.010)], and CM consumption [OR = 2.50, (95% CI 1.20-5.21), P =0.014)] increased the risk of MS. While performing hajj [OR = 0.47, (95% CI 0.34-0.67), P =0.001)], TB infection [OR = 0.29, (95% CI 0.11-0.78), P =0.015)], face veiling [OR = 0.32, (95% CI 0.23-0.47), P =0.001)] and coffee consumption [OR =0.67, (95% CI 0.49-0.89), P =0.008)], appeared to be associated with decreased risk. No association was found between fast food, processed meat, soft drinks, animal milk (other than camel) or RM consumption and the risk of MS. Conclusion The results of this case-control study confirm that different means of tobacco smoking are associated with increased risk of MS. It also sheds more light on the complex association between infections and MS.

Food insecurity and lipid profile abnormalities are associated with an increased risk of non-alcoholic fatty liver disease (NAFLD): a case-control study

2019 ◽  
Author(s):  
Helda Tutunchi ◽  
Maryam Saghafi-Asl ◽  
Mohammad Asghari-Jafarabadi ◽  
Alireza Ostadrahimi
Keyword(s):  
Risk Factors ◽  
Liver Disease ◽  
Food Insecurity ◽  
Fatty Liver Disease ◽  
Case Control Study ◽  
Case Control ◽  
Alcoholic Fatty Liver ◽  
Increased Risk ◽  
Alcoholic Fatty Liver Disease ◽  
Control Study

Abstract Background Non-alcoholic fatty liver disease (NAFLD) is an important public health problem and a significant cause of morbidity and mortality. Little is known about the relation between food insecurity and NAFLD. This study aimed to assess the relationship between food insecurity, risk factors associated with food insecurity, and NAFLD prevalence in a sample of Iranian adults.Methods In this age-matched and gender-matched case–control study, 210 subjects were recruited. NAFLD diagnosis was performed by a single expert radiologist using ultrasonography. The demographic and socioeconomic characteristics, anthropometric indices, body composition, along with food insecurity and depression status were assessed. Blood samples were collected to determine the lipid profile parameters. Chi-square, independent samples t-test, and uni-and multi-variate logistic regression tests were used. Data were analysed using SPSS V.23.0.Results The prevalence of food insecurity was 56.8% and 26.1% in cases and controls ( P<0.001 ), respectively. According to final analysis model, food insecurity, depression, number of children≥4, overweight, and obesity were identified as significant independent risk factors for NAFLD. The chance of NAFLD in the food insecure, depressed, overweight, and obese subjects was 2.2 (95%CI:1.12-3.43), 1.9 (95%CI:1.02-3.62), 2.6 (95% CI:1.81-3.92), and 2.9 (95%CI:2.02- 5.34) times higher, respectively. Additionally, a higher waist circumference (men, OR = 2.9, P<0.001 ; women, OR= 2.6, P<0.001 ), an elevated waist-to-hip ratio (men, OR = 2.3, P<0.001 ; women, OR= 2.7, P<0.001 ), an increased waist-to-height ratio (OR = 2.9, P<0.001 ), and a higher body fat percentage (men, OR = 3.0, P<0.001 ; women, OR= 3.3, P<0.001 ) were independently associated with an increased risk of NAFLD. The odds of NAFLD increased by increment in serum triglyceride (TG) levels (OR = 2.6, P<0.001 ) and decreased by increase in serum high-density lipoprotein cholesterol (HDL-C) (OR = 0.34, P<0.001 ). Compared to controls, NAFLD patients were more likely to have higher TG/HDL-C ratio (OR = 3.3, P<0.001 ).Conclusions The prevalence of food insecurity in patients with NAFLD was significantly higher compared to controls. Food insecurity was associated with an increased risk of NAFLD, even after adjusting for potential confounding factors. Additionally, NAFLD was significantly related to some indicators of dyslipidemia.

Food insecurity and lipid profile abnormalities are associated with an increased risk of non- alcoholic fatty liver disease (NAFLD): a case-control study in northwest of Iran

2020 ◽  
Author(s):  
Helda Tutunchi ◽  
Maryam Saghafi-Asl ◽  
Mohammad-Javad Hosseinzadeh Attar ◽  
Mohammad Asghari-Jafarabadi ◽  
Alireza Ostadrahimi
Keyword(s):  
Risk Factors ◽  
Liver Disease ◽  
Food Insecurity ◽  
Fatty Liver Disease ◽  
Case Control Study ◽  
Case Control ◽  
Alcoholic Fatty Liver ◽  
Increased Risk ◽  
Alcoholic Fatty Liver Disease ◽  
Control Study

Abstract Background Non-alcoholic fatty liver disease (NAFLD) is an important public health problem and a significant cause of morbidity and mortality. Little is known about the relation between food insecurity and NAFLD. This study aimed to assess the relationship between food insecurity, risk factors associated with food insecurity, and NAFLD prevalence in a sample of Iranian adults.Methods In this age-matched and gender-matched case–control study, 210 subjects were recruited. NAFLD diagnosis was performed by a single expert radiologist using ultrasonography. The demographic and socioeconomic characteristics, anthropometric indices, body composition, along with food insecurity and depression status were assessed. Blood samples were collected to determine the lipid profile parameters. Chi-square, independent samples t-test, and uni-and multi-variate logistic regression tests were used. Data were analysed using SPSS V.23.0.Results The prevalence of food insecurity was 56.8% and 26.1% in cases and controls ( P<0.001 ), respectively. According to final analysis model, food insecurity, depression, number of children ≥ 4, overweight, and obesity were identified as significant independent risk factors for NAFLD. The chance of NAFLD in the food insecure, depressed, overweight, and obese subjects was 2.2 (95%CI: 1.12-3.43), 1.9 (95%CI: 1.02-3.62), 2.6 (95%CI: 1.81-3.92), and 2.9 (95%CI: 2.02- 5.34) times higher, respectively. Additionally, a higher waist circumference (men, OR = 2.9, P < 0.001 ; women, OR= 2.6, P< 0.001 ), an elevated waist-to-hip ratio (men, OR=2.3, P<0.001 ; women, OR=2.7, P<0.001 ), an increased waist-to-height ratio (OR=2.9, P<0.001 ), and a higher body fat percentage (men, OR=3.0, P<0.001 ; women, OR=3.3, P<0.001 ) were independently associated with an increased risk of NAFLD. The odds of NAFLD increased by increment in serum triglyceride (TG) levels (OR=2.6, P<0.001 ) and decreased by increase in serum high-density lipoprotein cholesterol (HDL-C) (OR=0.34, P<0.001 ). Compared to controls, NAFLD patients were more likely to have higher TG/HDL-C ratio (OR =3.3, P<0.001 ).Conclusions The prevalence of food insecurity in patients with NAFLD was significantly higher compared to controls. Food insecurity was associated with an increased risk of NAFLD, even after adjusting for potential confounding factors. Additionally, NAFLD was significantly related to some indicators of dyslipidemia.

scholarly journals Peripartum Predictors of the Risk of Postpartum Depressive Disorder: Results of a Case-Control Study

2020 ◽  
Vol 17 (23) ◽  
pp. 8726 ◽  
Author(s):  
Kornelia Zaręba ◽  
Jolanta Banasiewicz ◽  
Hanna Rozenek ◽  
Stanisław Wójtowicz ◽  
Grzegorz Jakiel
Keyword(s):  
Risk Factors ◽  
Mood Disorders ◽  
Medical Records ◽  
Case Control Study ◽  
Uterine Cavity ◽  
Control Group ◽  
Gynecology And Obstetrics ◽  
Increased Risk ◽  
Retrospective Comparative Study ◽  
Control Study

Background: The study aimed at the identification of the risk factors present during delivery, which might be present in prophylactic programs concerning postpartum mood disorders. Material and Method: This was a retrospective comparative study. The study material included data retrieved from the medical records of patients hospitalized in the Teaching Department of Gynecology and Obstetrics of Professor Orłowski Hospital in Warsaw, in the years 2010–2017. The EPDS data of 604 patients were analyzed. The study group included 75 women who obtained at least 12 points in the EPDS and the control group was made up of 75 women who obtained no more than 5 points in the EPDS. Results: The women in whom we noted an increased risk of developing mood disorders had blood loss >1000 mL and had a significantly longer stage II and III of labor than the control group. Other risk factors were cesarean section, vaginal delivery with the curettage of the uterine cavity, slightly lower APGAR scores (0.4 pts), and lower birth weight (approximately 350 g) of the child. Women at a low risk of postpartum mood disorders more commonly underwent episiotomy during delivery (76%). Conclusions: Increased supervision and support should be offered to women who experienced the above-mentioned risk factors.

Predictors of therapy-related leukemia and myelodysplasia following autologous transplantation for lymphoma: an assessment of risk factors

Blood ◽  
2000 ◽  
Vol 95 (5) ◽  
pp. 1588-1593 ◽  
Author(s):  
Amrita Krishnan ◽  
Smita Bhatia ◽  
Marilyn L. Slovak ◽  
Daniel A. Arber ◽  
Joyce C. Niland ◽  
...  
Keyword(s):  
Risk Factors ◽  
Multivariate Analysis ◽  
Stem Cell ◽  
Case Control Study ◽  
Case Control ◽  
High Dose ◽  
Stem Cell Rescue ◽  
Increased Risk ◽  
Conditioning Regimens ◽  
Control Study

We analyzed data on 612 patients who had undergone high-dose chemoradiotherapy (HDT) with autologous stem cell rescue for Hodgkin's disease (HD) and non-Hodgkin's lymphoma (NHL) at the City of Hope National Medical Center, to evaluate the incidence of therapy-related myelodysplasia (t-MDS) or therapy-related acute myeloid leukemia (t-AML) and associated risk factors. A retrospective cohort and a nested case-control study design were used to evaluate the role of pretransplant therapeutic exposures and transplant conditioning regimens. Twenty-two patients developed morphologic evidence of t-MDS/t-AML. The estimated cumulative probability of developing morphologic t-MDS/t-AML was 8.6% ± 2.1% at 6 years. Multivariate analysis of the entire cohort revealed stem cell priming with VP-16 (RR = 7.7, P = 0.002) to be independently associated with an increased risk of t-MDS/t-AML. The influence of pretransplant therapy on subsequent t-MDS/t-AML risk was determined by a case-control study. Multivariate analysis revealed an association between pretransplant radiation and the risk of t-MDS/t-AML, but failed to reveal any association with pretransplant chemotherapy or conditioning regimens. However, patients who had been primed with VP-16 for stem cell mobilization were at a 12.3-fold increased risk of developing t-AML with 11q23/21q22 abnormalities (P = 0.006). Patients undergoing HDT with stem cell rescue are at an increased risk of t-MDS/t-AML, especially those receiving priming with VP-16 for peripheral stem cell collection.

Association between Statin and Fibrate Use and Venous Thromboembolism: A Case-Control Study.

Blood ◽  
2004 ◽  
Vol 104 (11) ◽  
pp. 2594-2594
Author(s):  
Karine Lacut ◽  
Gregoire Le Gal ◽  
Emmanuel Oger ◽  
Dominique Mottier
Keyword(s):  
Risk Factors ◽  
Venous Thromboembolism ◽  
Protective Effect ◽  
Case Control Study ◽  
Case Control ◽  
Increased Risk ◽  
Venous Thromboembolic ◽  
The Difference ◽  
Control Study ◽  
Statin Use

Abstract Background: Previous studies of selected patients have suggested a reduction in the risk of venous thromboembolism (VTE) with the use of statins, and no effect of fibrates. Objective: To evaluate the influence of statin and fibrate use on the risk of venous thromboembolic events. Design: Case-control study (EDITH) designed to investigate genetic and environmental risk factors of VTE. Setting: Brest University Hospital. Participants: 857 patients consecutively hospitalized for a documented venous thromboembolic event were included between May 2000 and May 2004. Controls were matched on age, sex and the main risk factors of VTE (cancer, surgery, pregnancy…). Results: The mean age of patients was 67.7 year. No significant difference was found between cases and controls concerning the main characteristics, except for smocking and body mass index. Controls had more often previous vascular events (coronary heart disease, stroke or arteriopathy of the lower limbs) than cases but the difference was no significant. Statin use was associated with a significant decreased risk of VTE (odds ratio (OR) = 0.58; 95% confidence interval (CI), 0.41–0.82), whereas fibrate use was associated with a significant increased risk of VTE (OR = 1.60; 95% CI, 1.09–2.34). After adjustment on the main confounding factors including aspirin use and cardiovascular disease, these associations remained significant. Among pleiotropic effects of statins, some antithrombotic mechanisms could be proposed to explain their possible protective effect. Concerning the possible negative effect of fibrates, some authors found that the most prescribed fibrates, but not statins, caused hyperhomocysteinemia. In our study, analyses of homocysteinemia are ongoing. Conclusion: In this case-control study of hospitalized patients, statin use was associated with a significant decreased risk of VTE, whereas fibrate use was associated with a significant increased risk. Homocysteinemia may be involved in the difference between the effects of these two categories of lipid-lowering drugs on VTE. Because our study was observational, the protective effect of statins as regards the risk of VTE remains questionable and further prospective studies are needed.

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