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. 2017 Feb 21;4(1):e7. doi: 10.2196/mental.6545

Table 2.

Mean number of items administered and correlation with total estimated theta under one or two stopping rules.

Stopping rule	Distress		Depression		Anxiety		Somatization
Stopping rule	Number of items, mean (SD)	Correlation^a	Number of items, mean (SD)	Correlation^a	Number of items, mean (SD)	Correlation^a	Number of items, mean (SD)	Correlation^a
None	16	1.00	6	1.00	12	1.00	16	1.00
SE^b (θ) = SE (full)	6.3 (4.3)	0.96	5.4 (1.2)	0.99	8.7 (4.3)	0.97	12.9 (2.1)	0.95
Maximum items^c	5.0 (2.1)	0.79	3.0 (0)	0.96	4.9 (1.4)	0.92	7.9 (0.3)	0.92

^aCorrelation between CAT θ and complete test θ.

^bSE: standard error.

^cMaximum items are determined by dividing the number of items by 2.