Fig. 3
From: Early life events may be the first steps on the multistep path to amyotrophic lateral sclerosis
Normalised data from questionnaire responses (ie, percentage of ALS respondents divided by percentage of control respondent × 100) to demonstrate risk trends for selected variables. Items above the dotted line at y = 100 indicate an increased proportion of people with ALS compared to controls, and below this line a decreased proportion of people with ALS compared to controls. a Place of birth. b Years spent in country areas. c Years spent in city areas. d Father age at respondent birth. e Mother age at respondent birth. f Highest level of education. g Years spent in education. h Age when started smoking cigarettes.
