When it comes to assessing the impact of e-cigarettes, estimates of device prevalence matter: the BIDI Stick disposable device

Table 4 Prevalence estimates for the BIDI® Stick brand among a probability-based sample of young adults

	18–20 years
	W% [95% CI]	EWNP [95% CI]^‡
Has ever used the brand^a	3.90 [2.49–5.81]	470,000 [300,000–700,000]
Now uses the brand every day or some days	0.60 [0.17–1.55]	70,000 [20,000–180,000]

W% weighted percentage, CI confidence interval, and EWNP estimated weighted number of persons
^‡Rounded down to the nearest 10,000 persons
^aEven once or twice

ISSN: 1477-7517