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Short term increase in risk of breast cancer associated with full term pregnancy.

1990; BMJ; Volume: 300; Issue: 6724 Linguagem: Inglês

10.1136/bmj.300.6724.578

0959-8138

Evelyn Williams, Leslie B. Jones, Martin Vessey, Klim McPherson,

Birth, Development, and Health

determine which statements described them and were related to their health.The patient could answer only yes or no to each question.An example of a question about sleep and rest is, "I spend much of the day lying down in order to rest." TIME TRADE OFF TECHNIQUEThe time trade off technique is used to derive a "utility," a score between 0 and 1, in which 1 represents perfect health and 0 a state in which the patient is indifferent between life and death."With the help of visual aids patients were asked how many years of their current health they would be willing to forgo to achieve perfect health.For example, if a 36 year old patient stated that she was unable to choose between four years of perfect health and 40 years of her current health the utility of her current health state was 4/40=0 10 (she would be willing to give up 36 years of her current health to achieve four years of perfect health).