more hospital visits than males. females also have a greater tendency to develop psychological disorders compared to males. females spend more years in good health than males; however, females spend more years in poor health than males as a proportion of their life expectancy. this implies that the male morbidity advantage is linked to the female survival advantage. potential bias data collected from a research study in denmark indicated that the paradox is likely due, in part, to selection bias. females have higher preferences for absenteeism. on average, they are absent from work for health reasons more often than males, including when they do not have objectively worse health. it may also be a possibility that under-reporting and selective non-participation of health problems, and delaying medical attention and treatment may make it appear that males have less medical problems than females. misperceptions, such as females being more protected from cardiovascular diseases, may contribute to the morbidity-mortality paradox; females tend to have less aggressive treatment regimens, shown by having lower diagnostic angiograms and interventional procedures when compared to males. researchers also suggest that because males have been shown to have an increased likelihood of suddenly dying, females may appear to have higher incidence of morbidity when surveyed in research studies; in other words, females tend to outlive males, and the females carry diseases that are counted as morbidity in studies while males die earlier from these morbidities and leave healthier male counterparts in the study, which makes it appear that they have lower morbidity than females. however, in a systematic review encompassing over 37,000 adults from developed and developing countries, this confounder appeared to be discredited since females experienced higher frailty index scores (used as a surrogate to measure morbidity) than males for any age group.