Table 2.

Correlation coefficients of CO and carbonyl compounds in e-cigarette aerosols. Asterisk marks (*) indicate Pearson’s correlation coefficients with statistical significance (p < 0.05).

E-Cigarette Type	Formaldehyde	Acetaldehyde	Acrolein	Glyoxal
Cig-a-like (tobacco)	0.820 *	0.821 *	0.837 *	0.823 *
Cig-a-like (grape)	0.476	0.380	–	0.478
Top-coil	0.909 *	0.857 *	0.901 *	0.620 *
‘mod’	0.847 *	0.855 *	0.776 *	0.609 *
JUUL	0.335	0.429	–	0.296