Interviewer instructions
Determine how the illness was detected or identified in the sick person. Was it by symptomatic diagnosis (identify illness using symptoms or description of the pain given by the sick person), clinical diagnosis (by physical examination)-examining the sick person by touching or checking the affected part(s) of the body, microscopy/blood slide (diagnosis by examining blood sample using a microscope).
Question post text
If answer is 1, 2 or 5 > Go to 10.20 (b1_20 - variable name in dataset).