A Proportional Hazards Model Taking Account of Long-Term Survivors

Biometrics ◽  
1998 ◽  
Vol 54 (4) ◽  
pp. 1508 ◽  
Author(s):  
Alexander Tsodikov
Keyword(s):  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Hazards Model ◽  
Long Term Survivors

Inter-pregnancy interval and later pediatric cardiovascular health of the offspring – a population-based cohort study

2020 ◽  
pp. 1-5
Author(s):  
Majdi Imterat ◽  
Tamar Wainstock ◽  
Eyal Sheiner ◽  
Gali Pariente
Keyword(s):  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Population Based ◽  
Cox Proportional Hazards ◽  
Cardiovascular Morbidity ◽  
Cox Proportional Hazards Model ◽  
Hazards Model ◽  
Kaplan Meier ◽  
Inter Pregnancy Interval

Abstract Recent evidence suggests that a long inter-pregnancy interval (IPI: time interval between live birth and estimated time of conception of subsequent pregnancy) poses a risk for adverse short-term perinatal outcome. We aimed to study the effect of short (<6 months) and long (>60 months) IPI on long-term cardiovascular morbidity of the offspring. A population-based cohort study was performed in which all singleton live births in parturients with at least one previous birth were included. Hospitalizations of the offspring up to the age of 18 years involving cardiovascular diseases and according to IPI length were evaluated. Intermediate interval, between 6 and 60 months, was considered the reference. Kaplan–Meier survival curves were used to compare the cumulative morbidity incidence between the groups. Cox proportional hazards model was used to control for confounders. During the study period, 161,793 deliveries met the inclusion criteria. Of them, 14.1% (n = 22,851) occurred in parturient following a short IPI, 78.6% (n = 127,146) following an intermediate IPI, and 7.3% (n = 11,796) following a long IPI. Total hospitalizations of the offspring, involving cardiovascular morbidity, were comparable between the groups. The Kaplan–Meier survival curves demonstrated similar cumulative incidences of cardiovascular morbidity in all groups. In a Cox proportional hazards model, short and long IPI did not appear as independent risk factors for later pediatric cardiovascular morbidity of the offspring (adjusted HR 0.97, 95% CI 0.80–1.18; adjusted HR 1.01, 95% CI 0.83–1.37, for short and long IPI, respectively). In our population, extreme IPIs do not appear to impact long-term cardiovascular hospitalizations of offspring.

scholarly journals Effects of Serum Albumin Levels on Antithrombin Supplementation Outcomes Among Patients With Sepsis-Associated Coagulopathy: A Retrospective Study

2019 ◽  
Vol 12 ◽  
pp. 1179545X1985836
Author(s):  
Masatomo Ebina ◽  
Kazunori Fujino ◽  
Akira Inoue ◽  
Koichi Ariyoshi ◽  
Yutaka Eguchi
Keyword(s):  
Retrospective Study ◽  
Serum Albumin ◽  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Term Survival ◽  
Hazards Model ◽  
The Relationship

Background:Severe sepsis is commonly associated with mortality among critically ill patients and is known to cause coagulopathy. While antithrombin is an anticoagulant used in this setting, serum albumin levels are known to influence serum antithrombin levels. Therefore, this study aimed to evaluate the outcomes of antithrombin supplementation in patients with sepsis-associated coagulopathy, as well as the relationship between serum albumin levels and the effects of antithrombin supplementation.Methods:This retrospective study evaluated patients who were >18 years of age and had been admitted to either of two intensive care units for sepsis-associated coagulopathy. The groups that did and did not receive antithrombin supplementation were compared for outcomes up to 1 year after admission. Subgroup analyses were performed for patients with serum albumin levels of <2.5 g/dL or ⩾2.5 g/dL.Results:Fifty-one patients received antithrombin supplementation and 163 patients did not. The Cox proportional hazards model revealed that antithrombin supplementation was independently associated with 28-day survival (hazard ratio [HR]: 0.374, P = 0.025) but not with 1 year survival (HR: 0.915, P = 0.752). In addition, among patients with serum albumin levels of <2.5 g/dL, antithrombin supplementation was associated with a significantly lower 28-day mortality rate (9.4% vs 36.8%, P = .009).Conclusion:Antithrombin supplementation may improve short-term survival, but not long-term survival, among patients with sepsis-associated coagulopathy.

Maternal Hypothyroidism during Pregnancy and the Risk for Infectious Morbidity of the Offspring

2019 ◽  
Vol 37 (03) ◽  
pp. 291-295 ◽  
Author(s):  
Ofer Beharier ◽  
Asnat Walfisch ◽  
Tamar Wainstock ◽  
Irit Szaingurten-Solodkin ◽  
Daniela Landau ◽  
...  
Keyword(s):  
Animal Studies ◽  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Infectious Morbidity ◽  
Hazards Model ◽  
Kaplan Meier ◽  
Increased Risk

Abstract Objective Animal studies indicate a possible intrauterine immunological imprinting in pregnancies complicated by hypothyroidism. We aimed to evaluate whether exposure to maternal hypothyroidism during pregnancy increases the risk of long-term infectious morbidity of the offspring. Study Design A retrospective cohort study compared the long-term risk of hospitalization associated with infectious morbidity in children exposed and unexposed in utero to maternal hypothyroidism. Outcome measures included infectious diagnoses obtained during any hospitalization of the offspring (up to the age of 18 years). Results The study included 224,950 deliveries. Of them, 1.1% (n = 2,481) were diagnosed with maternal hypothyroidism. Children exposed to maternal hypothyroidism had a significantly higher rate of hospitalizations related to infectious morbidity (13.2 vs. 11.2% for control; odds ratio: 1.2; 95% confidence interval: 1.08–1.36; p = 0.002). Specifically, incidences of ear, nose, and throat; respiratory; and ophthalmic infections were significantly higher among the exposed group. The Kaplan–Meier curve indicated that children exposed to maternal hypothyroidism had higher cumulative rates of long-term infectious morbidity. In the Cox proportional hazards model, maternal hypothyroidism remained independently associated with an increased risk of infectious morbidity in the offspring while adjusting for confounders. Conclusion Maternal hypothyroidism during pregnancy is associated with significant pediatric infectious morbidity of the offspring.

scholarly journals Risk factors for failure in small businesses in the footwear and textile industry of Gauteng Province, South Africa

2015 ◽  
Vol 5 (3) ◽  
pp. 114-125
Author(s):  
Zeleke Worku
Keyword(s):  
South Africa ◽  
Financial Services ◽  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Gauteng Province ◽  
Entrepreneurial Skills ◽  
Hazards Model

The study was based on the 5-yearlong study (2007 to 2012) of Small, Micro and Medium-sized Enterprises (SMMEs) that conduct business in Gauteng Province, South Africa conducted by Marivate (2014) from 2007 to 2012. The sample consisted of 187 businesses (36.52%) that utilized financial services routinely provided by the South African Small Enterprises Development Agency (SEDA), and 325 businesses (63.48%) that utilized non-financial services provided by SEDA. Out of the 187 businesses that utilized financial services, 85.42% of them were viable, whereas 14.58% of them were not viable. Out of the 325 businesses that utilized non-financial services, 43.25% of them were viable, whereas 56.75% of them were not viable. The degree of entrepreneurial skills in each of the 512 businesses that were selected for the study was measured by using a composite index defined by Le Brasseur, Zannibbi & Zinger (2013). The multilevel logistic regression model (Hosmer and Lemeshow) was used for identifying and quantifying predictors of utilization of financial and non-financial services provided by SEDA to SMMEs. Predictors of long-term survival were estimated by using the Cox Proportional Hazards Model (Cleves, Gould & Gutierrez, 2004). The results showed that the 187 businesses that utilized financial services (36.52%) were relatively more viable in comparison with businesses that utilized non-financial services (63.48%). Results obtained from the Cox Proportional Hazards Model showed that long-term viability in the 512 businesses that were selected for the study was significantly influenced by utilization of financial services, degree of entrepreneurial skills, and the ability to order large volumes of stock in bulk, in a decreasing order of strength. The top 3 predictors of utilization of financial services in the 187 businesses that utilized financial services were degree of entrepreneurial skills, the ability to order large volumes of stock in bulk, and access to training opportunities on entrepreneurial or vocational skills, in a decreasing order of strength. The top 3 predictors of utilization of non-financial services in the 325 businesses that utilized non-financial services were the age of business, past history of bankruptcy, and the practice of selling on credit, in a decreasing order of strength.

scholarly journals Minocycline-Induced Cutaneous Hyperpigmentation in an Orthopedic Patient Population

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Yuri Hanada ◽  
Elie F. Berbari ◽  
James M. Steckelberg
Keyword(s):  
Risk Factors ◽  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Normal Skin ◽  
Shoulder Prosthesis ◽  
Hazards Model ◽  
Orthopedic Patient ◽  
Potential Risk Factors ◽  
History Of

Abstract Background.  The objectives of this study were to estimate the incidence and evaluate risk factors for development of minocycline-induced cutaneous hyperpigmentation in patients with orthopedic infections. Methods.  Patients with orthopedic infections evaluated at Mayo Clinic (Rochester, MN) and treated with minocycline from 1 January 2002 to 31 December 2011 were retrospectively identified. Long-term minocycline suppression was defined as daily minocycline use for at least 3 months. A proportional hazards model was used to evaluate potential risk factors. Results.  Of 291 patients receiving long-term minocycline suppression, 54% (156 of 291) developed hyperpigmentation after a mean follow-up of 4.8 years (range, 0.3–13.2 years); 88% involved blue-gray pigmentation of normal skin that appeared most commonly in the lower (75%) and upper extremities (44%). The mean duration of minocycline therapy before hyperpigmentation was 1.5 years (range, 0.1–9 years) with a mean cumulative dosage of 107.3 g (range, 8.6–657 g). Notable risk factors include a history of vitamin D deficiency (relative risk [RR], 6.29; 95% confidence interval [CI], 1.91–15.27; P = .0052), presence of a shoulder prosthesis (RR, 3.2; 95% CI, 1.23–6.56; P = .0062), noncirrhotic liver pathology (RR, 3.63; 95% CI, 1.11–8.75; P = .0359), and use of a concurrent medication also known to cause hyperpigmentation (RR, 4.75; 95% CI, 1.83–10.1; P = .0029). Conclusions.  Hyperpigmentation associated with the use of long-term minocycline suppression in patients with orthopedic infections is common.

The long-term prognosis of pneumomediastinum associated with dermatomyositis: a two-centre retrospective cohort study

Rheumatology ◽  
2020 ◽  
Author(s):  
Can Li ◽  
Mei’e Liang ◽  
Hui Jiang ◽  
Jiuliang Zhao ◽  
Chanyuan Wu ◽  
...  
Keyword(s):  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Term Survival ◽  
Long Term Survival ◽  
Hazards Model ◽  
Long Term Prognosis

Abstract Objectives Pneumomediastinum (PnM) is a rare but life-threatening complication of DM. The present study aims to characterize the long-term prognosis and prognostic factors of DM-associated PnM. Methods Inpatients with DM-associated PnM were retrospectively enrolled from two tertiary referral centres for rheumatic disease. The enrolled patients were divided into survivors or non-survivors. Information about the demographics, clinical manifestations, CT scan features, laboratory findings and outcomes were collected from their medical records. A least absolute shrinkage and selection operator regularized Cox regression model was used to select the most relevant factors. Prognosis was analysed using a Kaplan–Meier curve. A Cox proportional hazards model was used to identify independent predictive factors for long-term survival. Results A total of 62 patients (26 women) with DM-associated PnM were enrolled. The mean age was 44.3 years (s.d. 11.7). The median follow-up duration was 17 days (quartiles 7, 266.5). Thirty-five patients died during follow-up. The survival rates were 75.4% at 1 week, 46.2% at 3 months and 41.9% at 1 year. The Cox proportional hazards model identified the development of fever [hazard ratio (HR) 3.23 (95% CI 1.25, 8.35), P = 0.02] and a decrease in the number of lymphocytes [HR 2.19 (95% CI 1.10, 4.39), P = 0.03] as independent risk factors for death. Conclusion The results suggest poor overall survival among patients with DM-associated PnM. Survival during the first 3 months is crucial for long-term survival. Meanwhile, the development of fever and a decrease in the number of lymphocytes were associated with long-term mortality. Early recognition and prompt treatment of this high-risk group of DM patients is therefore important.

scholarly journals Maternal hepatitis B or C carrier status and long-term risk for offspring neurological morbidity: a population-based cohort study

2021 ◽  
pp. 1-5
Author(s):  
Israel Yoles ◽  
Eyal Sheiner ◽  
Naim Abu-Freha ◽  
Tamar Wainstock
Keyword(s):  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Survival Curve ◽  
Population Based ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Carrier Status ◽  
Hazards Model ◽  
Kaplan Meier

Abstract Hepatitis B and hepatitis C (HBV/HCV) are important global public health concerns. We aimed to evaluate the association between maternal HBV/HCV carrier status and long-term offspring neurological hospitalisations. A population-based cohort analysis compared the risk for long-term childhood neurological hospitalisations in offspring born to HBV/HCV carrier vs. non-carrier mothers in a large tertiary medical centre between 1991 and 2014. Childhood neurological diseases, such as cerebral palsy, movement disorders or developmental disorders, were pre-defined based on ICD-9 codes as recorded in hospital medical files. Offspring with congenital malformations and multiple gestations were excluded from the study. A Kaplan–Meier survival curve was constructed to compare cumulative neurological hospitalisations over time, and a Cox proportional hazards model was used to control for confounders. During the study period (1991–2014), 243,682 newborns met the inclusion criteria, and 777 (0.3%) newborns were born to HBV/HCV mothers. The median follow-up was 10.51 years (0–18 years). The offspring from HBV/HCV mothers had higher incidence of neurological hospitalisations (4.5 vs. 3.1%, hazard ratio (HR) = 1.91, 95% CI 1.37–2.67). Similarly, the cumulative incidence of neurological hospitalisations was higher in children born to HBV/HCV carrier mothers (Kaplan–Meier survival curve log-rank test p < 0.001). The increased risk remained significant in a Cox proportional hazards model, which adjusted for gestational age, mode of delivery and pregnancy complications (adjusted HR = 1.40, 1.01–1.95, p = 0.049). We conclude that maternal HBV or HCV carrier status is an independent risk factor for the long-term neurological hospitalisation of offspring regardless of gestational age and other adverse perinatal outcomes.

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