13 Earlier reviews have tried to determine whether HEMS, compared to ground emergency medical services (GEMS), improve mortality and morbidity, although morbidity was difficult to assess.
Following the implementation of safety standards outcomes after anaesthesia have improved, although estimations of perioperative complications and postoperative morbidity are difficult.
While co-morbidity is difficult to address in humans, transgenic mice offer the selective advantage to determine whether reduction in insulin levels can exacerbate a pre-existing tau pathology.
Our study had many limitations that need to be recognized, we didn't have data on iron stores and serum albumin this is mainly due to lack of financial recourses, medical data about the exact nature and details of co-morbidities was difficult to obtain, so we just asked our patients about nature and presence or absence of co morbidities.
But, any comparison between the different morbidity registrations is difficult.
Due to the common occurrance of co-morbidities, it is difficult to dissect which susceptibility loci are truly shared and which are specific.
Lung cancer has a high morbidity because it is difficult to detect early and is frequently resistant to available chemotherapy and radiotherapy.
Though the sources are to some extent complementary, the data they provide nevertheless represent a patchwork of information from which a coherent picture of mortality, morbidity and health is difficult to draw.
The estimation of burden of disease averted (both morbidity and mortality) is difficult as data on measles and diarrhea incidence and deaths are limited.
