Table 2.

Within-group contrast estimates and significance tests for suicidal ideation

		Contrast
		Preintervention to postintervention	Preintervention to 6-month follow-up	Preintervention to 12-month follow-up
Condition	Statistic
Internet only	Contrast estimate	−0.54	−0.79	−0.97
	Test value	t(109.8)=−1.98	t(101.5)=−2.50	t(73.2)=−3.65
	p Value	0.050	0.016	<0.001
Internet+telephone call back	Contrast estimate	−0.06	−0.48	−1.12
	Test value	t(121.3)=−0.20	t(106.2)=−1.45	t(80.8)=−3.91
	p Value	0.85	0.15	<0.001
Telephone call back only	Contrast estimate	−0.79	−0.68	−0.68
	Test value	t(105.6)=−3.05	t(100.0)=−2.22	t(78.0)=−2.61
	p Value	0.003	0.029	0.011
Treatment as usual	Contrast estimate	−0.80	−0.66
	Test value	t(108.0)=−2.89	t(103.1)=−1.96
	p Value	0.005	0.053