Characteristics of health care workers who provided care to intubated SARS patients in Toronto, by SARS acquisition status.

aValues are given as median (lower quartile, upper quartile).
bChronic underlying illness is defined as having one or more of diabetes, chronic renal failure, chronic liver disease, chronic obstructive pulmonary syndrome, coronary artery disease, congestive heart failure, active cancer, HIV/AIDS, transplantation.
cFisher's exact test.
dCochran-Armitage test for trend.
esee reference 11.