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A microlife is a unit of risk representing half an hour change of life expectancy. 〔 Introduced by David Spiegelhalter and Alejandro Leiva, microlives are intended as a simple way of communicating the impact of a lifestyle or environmental risk factor, based on the associated daily proportional effect on expected length of life. Similar to the micromort (one in a million probability of death) the microlife is intended for "rough but fair comparisons between the sizes of chronic risks".〔David Spiegelhalter, Using speed of ageing and "microlives" to communicate the effects of lifetime habits and environment, BMJ, 345, December 2012, doi 10.1136/bmj.e8223 (), as corrected by BMJ 2012;345:e8676 ()〕 This is to avoid the biasing effects of describing risks in relative hazard ratios, converting them into somewhat tangible units. Similarly they bring long-term future risks into the here-and-now as a gain or loss of time. :"A daily loss or gain of 30 minutes can be termed a microlife, because 1 000 000 half hours (57 years) roughly corresponds to a lifetime of adult exposure."〔 The microlife exploits that for small hazard ratios the change in life expectancy is roughly linear.〔Haybittle JL. The use of the Gompertz function to relate changes in life expectancy to the standardized mortality ratio. Int J Epidemiol1998;27:885-9. ()〕 They are by necessity rough estimates, based on averages over population and lifetime. Effects of individual variability, short-term or changing habits, and causal factors are not taken into account. : == See also == * Micromort * Risk communication 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Microlife」の詳細全文を読む スポンサード リンク
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