Table 2.

Change in Bayesian information criterion (BIC) with increasing number of distinct trajectory classes fixed at quadratic polynomial in patients treated with tDCS + placebo, escitalopram + sham tDCS, and placebo + sham tDCS over 10 weeks.

	tDCS + placebo		Escitalopram + sham tDCS		Placebo + sham tDCS
k	BIC	2xΔBIC	BIC	2xΔBIC	BIC	2xΔBIC
1	3591.36	NA	3376.09	NA	2490.34	NA
2	3419.62	171.74	3297.50	78.59	2371.13	119.22
3	3404.19	15.43	3272.58	24.92	2360.02	11.11
4	3406.61	−2.42	3258.35	14.23	2369.11	−9.09
5	3416.20	−9.58	3265.46	−7.11	2377.55	−8.43

k number of trajectory classes; log Bayes factor approximations >10 were used as the criterion for favoring a more complex model; boldface indicates the optimal solution.