Methods:
Respondents were asked to check "yes" or "no" for a number of symptoms they might have experienced AFTER TERMINATION OF CO EXPOSURE.
The physical symptoms tabulated were: headache, muscle / joint pain, chest pain, tiredness / fatigue, dizziness / balance problems, numbness / tingling, visual / eye problems, sleep problems, change of taste or smell, and physical limitations.
The cognitive and intellectual symptoms tabulated were: difficulty making decisions, difficulty / problems at work, difficulty following directions, difficulty finding familiar places, problems balancing a checkbook, memory problems, attention / concentration difficulties, and difficulty sorting / organizing.
The emotional symptoms tabulated were: mood changes, increased use of illicit drugs or alcohol, temper problems, emotional swings, social problems, family problems, and school problems, and whether others believe they are different since being exposed to CO and and whether they believe they have undergone a change in personality and memory.
Finally, respondents were asked to comment on their medical treatment following discovery of the CO poisoning - whether they had received 100% oxygen and whether they had been admitted to a hospital (not simply visited an emergency center).