Some sites have also obtained ethics approval to offer more significant compensation for interviews of control group participants after the baseline interview, on the grounds that the opportunity cost of time is higher for TAU than for experimental group participants, who can store food provisions in their own apartment.
Some jurisdictions investigate outbreaks by using CATI interviews of controls sampled from a bank of potential study participants (3 ).
Deprivation was assessed using the NZDep2006 measure [ 17], an area-based measure derived from the 2006 census variables, based on place of residence at the time of diagnosis of the case and the time of interview of the control.
Hypertension, type 2 diabetes, hypercholesterolemia, and smoking status were assessed at the time of the MI (for case subjects) or the time of interview (for control subjects).
In addition, the date of interview of the controls, age of protective bilateral oophorectomy or age of bilateral mastectomy of the control subject was required to be after the date of breast cancer diagnosis of the matched case subject.
At the time of their interview 73% of controls reported using electricity for both cooking and heating, with only 18% using wood, charcoal, coal, or anthracite.
All participants were asked if they had ever been told by a physician that they had a prior non-malignant lung disease such as asthma, bronchitis, emphysema, pneumonia or tuberculosis at any age at least 2 years before any diagnosis of lung cancer (or date of interview for controls).
These time periods included physical activity after age 50 years up to reference date (date of diagnosis for cases and date of interview for controls) 3 and physical activity only in the year before interview 35.
For all remaining exposures, including consuming pasteurized and unpasteurized milk, ice, and foods, exposure was sought for the 2 weeks before onset of illness for patients and before date of interview for controls.
Disruption to tap water or change in tap water color or taste in the week before onset of illness for patients, and in the week before date of interview for controls, was recorded.
