Table 1

Statistical table

	Data structure (Shapiro–Wilk test)	Type of test	Power (95% CI between saline and nicotine mean)
a	Normal	Two-way ANOVA	−0.88 to −0.14
b	Normal	Two-way ANOVA	−0.40 to −0.27
c	Non-normal	Mann–Whitney U test	36.00–50.00
d	Non-normal	Mann–Whitney U test	−63.03 to −27.80
e	Non-normal	Mann–Whitney U test	−0.20 to −0.11