objective: pulmonary air-leakage especially pneumothorax (ptx), is a severe complication in neonates. the aim of this study was to assess the predisposing factors and frequency of ptx among the low birth weight (lbw) premature infants, under mechanical ventilation. methods: this cross sectional study was performed in 121 lbw intubated premature infants at neonatal intensive care unit of a child...

background and aims: pelvic organ prolapse (pop) is a common condition which affects on a large proportion of women. the objective of this study was to determine the risk factors of pop in iranian women. methods: this cross-sectional study was carried out to examine the role of demographic, anthropometric and clinical characteristics in pop disease in a sample of 365 females in ilam, iran. exam...

We propose an efficient semiparametric estimator for the multivariate linear quantile regression model in which the conditional joint distribution of errors given regressors is unknown. The procedure can be used to estimate multiple conditional quantiles of the same regression relationship. The proposed estimator is asymptotically as efficient as if the conditional distribution were known. Simu...