Table 1.

The Basic Statistics of Items in the Two Waves, Statistical Analysis of Change, and Test–Retest Correlations

Item	Wave 1	Wave 2	t (df)	p value	Effect size for change and 95% CIa	Test–retest correlationb
	M (SD)	M (SD)
Pleasant feeling	1.83 (0.93)	2.05 (1.00)	7.97 (1,031)	<.0001	0.34 (0.28–0.40)	.56
Unpleasant feeling	2.34 (1.08)	2.43 (1.05)	2.4 (1,009)	<.006	0.12 (0.05–0.18)	.48
Nausea	1.41 (0.81)	1.42 (0.81)	0.04 (1,125)	n.s.		.51
Relaxation	1.83 (0.99)	1.94 (1.04)	3.89 (1,089)	<.0001	0.11 (0.09–0.22)	.52
Dizziness	1.93 (1.05)	1.98 (1.07)	1.79 (1,125)	n.s.		.56
Rush or buzz	1.54 (0.86)	1.65 (0.91)	3.90 (1,060)	<.0001	0.16 (0.11–0.22)	.41
Coughing	2.06 (1.02)	2.05 (1.03)	0.41 (1,127)	n.s.		.58
Difficulty inhaling	2.04 (1.00)	2.04 (1.00)	0.07 (964)	n.s.		.51

Note. n.s. = non significant.

^aRefers to Cohen d for repeated measures (Cohen, 1977). According to Wolf (1986) interpretation, the effect size as large as 0.20, there is no practical difference, and effect size about 0.50 are important.

^bPearson’s correlation, N = 965–1,128.