TABLE 3.

Diagnostic Likelihood Ratios for Significant and Unique Individual Predictors and Combined Models

	Low	Medium	High
Independent Models
Concurrent Episodes
Rumination	0.44	0.57	3.97
Depressive Symptoms	0.29	1.09	2.60
Prospective Episodes
Rumination	0.58	0.91	1.94
Attributional Style	0.43	0.83	2.79
Depressive Symptoms	0.73	0.87	4.30
FLED
Rumination	0.40	1.26	0.94
rMDD
Rumination (6th Grade)	0.29	1.09	2.12
Attributional Style 9th Grade)	0.22	0.76	2.89
Depressive Symptoms (6th/9th)	0.81/0.50	0.95/1.01	2.17/3.48
Combined Models
Concurrent Episodes (Rumination and Depressive Symptoms)
	0.47	0.66	3.34
Prospective Episodes (Depressive Symptoms, Rumination, and Attributional Style)
	0.59	0.88	6.67
FLED (Rumination and Depressive Symptoms)
	0.49	1.00	1.85
rMDD (Rumination/Depressive Symptoms–6th Grade/Attributional Style/Depressive Symptoms–9th Grade).
	0.40/0.00	0.95/0.64	2.36/2.98

Note: The following are cutoff scores on each individual measure as well as for the combined models. Low: Rumination (0–19), Attributional Style (29–61), Depressive Symptoms (0–3), Combined Model = two low scores on individual inventories. Medium: Rumination (20–35), Attributional Style (62–114), Depressive Symptoms (4–14). Combined Model = two medium scores or one low, one medium, and one high score or two high scores and one low score. High: Rumination (36 and up), Attributional Style (115 and up), Depressive Symptoms (15 and up), Combined Model = all high scores or two high scores and one moderate score or one moderate score and one high score. For individuals strictly interested in FLED, only the rumination measure should be used. Table 3 presents the diagnostic likelihood ratios (DLRs) for different tertiles of each screening inventory, as well as the DLRs for different combinations of these tertiles. DLRs represent the ratio of target disorders present within a specific scoring range out of the total number of target disorders divided by the number of target disorders absent within that scoring range divided by the total number of target disorders absent (see Straus et al., 2011). Concurrent episodes = depression episode at baseline; Prospective episodes = a depression episode during the follow-up assessment; FLED = first lifetime episode of depression (i.e., episode of depression during 36 months with no lifetime history); rMDD = recurrent major depression disorder (i.e., more than one episode of depression over the lifetime); Rumination = total score on the Children’s Response Style Questionnaire–Rumination subscale (Abela et al., 2004); Attributional style = total score on the Adolescent Cognitive Style Questionnaire (Hankin & Abramson, 2002); Depressive symptoms = total score on the Children’s Depression Inventory (Kovacs, 1992).