Table 2.

Descriptive statistics of adverse birth outcomes

		Complete abstainers (N = 51,430)	Exclusive EC users (N = 337)	Exclusive CC smokers (N = 3,484)	Total (N = 55,251)
SGA	N	6,981	66	1,017	8,064
	WP	8.62%	14.00%	21.86%	9.26%
	95% CI	8.29–8.96%	8.88–21.38%	19.80–24.07%	8.93–9.60%
LBW	N	9,073	86	1,149	10,308
	WP	5.37%	7.34%	11.96%	5.68%
	95% CI	5.18–5.57%	5.22–10.21%	10.81–13.22%	5.50–5.88%
Preterm	N	7,674	66	752	8,492
	WP	7.15%	11.74%	10.57%	7.33%
	95% CI	6.86–7.44%	7.37–18.20%	9.26–12.05%	7.05–7.62%

EC Electronic cigarette, CC Conventional cigarette, SGA Small-for-gestational-age, LBW Low birthweight

Note: Statistics are given as unweighted frequency (N), survey-weighted percentage, (WP) and weighted 95% confidence intervals (95% CI).