Descriptive statistics for the cases and controls are presented in Table 1. The mean age of the controls was 35.7±5.5 (S.D.) years and the cases were 36.9±5.3 years, which corresponds to a significant difference (t=4.52, p<0.0001). There were fewer males in the control sample compared to the cases (Χ2=30.7, p<0.0001). There was also a significant association between responses to the “dizziness” item and case/control status (Χ2=42.7, p<0.0001). Table 1 includes response patterns for each group, where case subjects were more likely to endorse “intense” dizziness from smoking their first few cigarettes.
