Table 2 Prevalence of ENDS modifications by age group

From: Prevalence and reasons for electronic nicotine delivery systems modifications among U.S. youth, young adult, and adult users

  1. Colors (heat map) indicate comparative prevalence of each modification across age groups, with darker reds indicating the highest prevalence and darker green the lowest. The heat map compares all individual modifications, but not “any modifications” (e.g., “any e-liquid modification”); those are left blank.
  2. The estimates and confidence intervals for the estimated precent are weighted. 95% CI = 95% Confidence Interval.
  3. Groups with non-overlapping confidence intervals are significantly different.
  4. *Chi-square tests were used to test statistically significant differences in the prevalence across the three age groups using stacked weights. ANOVA was used to test significant differences in the average number of modifications across age groups.
  5. a,b,cGroups with different superscripts are significantly different from each other, based on post hoc pairwise comparisons with Bonferroni correction.
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