BACKGROUND In pulmonary tuberculosis (PTB), morbidity during treatment and residual pulmonary disability can be under-estimated. METHODS Among adults with smear-positive PTB at an outpatient clinic in Papua, Indonesia, we assessed morbidity at baseline and during treatment, and 6-month residual disability, by measuring functional capacity (six-minute walk test [6MWT] and pulmonary function), ...

aim and background: schizophrenia is a chronic psychiatric disease that has an important effect on patients’ quality of life and their function. the goal of this study was to evaluate the effect of compliance therapy on quality of life and global function of schizophrenic patient. methods and materials: in this randomized controlled trial 76 remission patients with schizophrenia were recruited ...

To study disease association with risk factors in epidemiologic studies, cross-sectional sampling is often more focused and less costly for recruiting study subjects who have already experienced initiating events. For time-to-event outcome, however, such a sampling strategy may be length biased. Coupled with censoring, analysis of length-biased data can be quite challenging, due to induced info...

In this paper, we study the relationship between the failure rate and the mean residual life of doubly truncated random variables. Accordingly, we develop characterizations for exponential, Pareto 11 and beta distributions. Further, we generalize the identities for fire Pearson and the exponential family of distributions given respectively in Nair and Sankaran (1991) and Consul (1995). Applicat...

Let X1, · · · , Xn and Y1, · · · , Yn be independent heterogeneous geometric random variables with parameters p1 ≤ · · · ≤ pn and q1 ≤ · · · ≤ qn, respectively. We prove that ∑k i=1Xi is larger than ∑k i=1 Yi, for k = 1, · · · , n, in mean residual life order if, and only if, the harmonic mean of p1, · · · , pk is smaller than the harmonic mean of q1, · · · , qk, for k = 1, · · · , n. In this w...

This paper provides a methodology to assess the efficiency of mean residual life (MRL) in condition-based maintenance decision-making for a system subjected to the competing and dependent risks of degradation and shock. Based on this system, the cost models of two quite simple policies implementing MRL-based or degradation-based preventive replacement are developed and compared with each other....

This paper presents a framework for online reliability estimation of physical systems utilising degradation signals. Most prognostics methods promoted in the literature for estimation of mean-residual-life of individual components utilise trending or forecasting models in combination with mechanistic or empirical failure definition models. In the absence of sound knowledge for the mechanics of ...

The mean residual life (MRL) measures the remaining life expectancy and is useful in actuarial studies, biological experiments and clinical trials. To assess the covariate effect, an additive MRL regression model has been proposed in the literature. In this paper, we focus on the topic of model checking. Specifically, we develop two goodness-of-fit tests to test the additive MRL model assumptio...