The above study states "None of The endocrine measures were associated with experiencing a chronic stressor (see Table 3)". Despite this, they go on to trust their subjective measures of "chronic stressors". Btw, the participants replied to newspaper ads stating payment for participation. (And they were paid $800). 40% developed "colds". Does this bias the findings? They also note that the association was reduced when health variables (such as smoking) were subtracted from the results.