Table 4.

Mixed Effects Regression Contrast Models on Overall Negative Mood, for the Total Sample and by Gender

	TOTAL					GIRLS						BOYS
	N	Estimate	SE	t	p	N (observations)	Estimate	SE	t	p	d	N (observations)	Estimate	SE	t	p	d
Contrast 1	148					87 (5,963)						61 (2,256)
Intercept		3.69	.13	28.15	.000		3.87	.18	21.80	.000			3.42	.18	19.14	.000
Time		-0.16	.04	-3.95	.000		-0.23	.05	-4.18	.000			-0.07	.06	-1.11	ns
Group		0.41	.30	1.37	ns		0.62	.40	1.54	ns			0.08	.42	0.18	ns
Group × Time		-0.52	.09	-5.94	.000		-0.20	.12	-1.71	.088	-0.46		-0.99	.13	-7.50	.000	-2.50
Contrast 2	66					39 (3,105)						27 (2,269)
Intercept		3.67	.22	16.48	.000		3.85	.31	12.53	.000			3.42	.27	12.53	.000
Time		-0.07	.06	-1.04	ns		-0.18	.09	-2.08	.037			0.08	.09	0.87	ns
Group		0.43	.34	1.25	ns		0.64	.47	1.37	ns			0.08	.43	0.19	ns
Group × Time		-0.62	.10	-6.10	.000		-0.24	.13	-1.82	.069	-0.59		-1.14	.15	-7.53	.000	-2.95
Contrast 3	154					87 (6,070)						67 (4,750)
Intercept		3.14	.12	25.71	.000		3.37	.17	19.51	.000			2.83	.16	17.29	.000
Time		-0.20	.04	-4.95	.000		-0.33	.06	-5.77	.000			-0.03	.05	-0.59	ns
Group		0.54	.24	2.19	.030		0.48	.34	1.40	ns			0.59	.33	1.76	.083
Group × Time		0.13	.07	1.75	.081		0.14	.11	1.35	ns	0.33		0.11	.10	1.12	ns	0.32

Note. Contrast 1: Triers/Experimenters v. Rapid Escalators; Contrast 2: Smokers v. Rapid Escalators; Contrast 3: Nonsmokers v. Smokers. Observations = number of mood reports examined.

Effect sizes for Group × Time effects calculated via Cohen’s d.