Table 1.

Results from 2 sample t tests on the Quick Inventory of Depressive Symptomatology—self report version 16 (QIDS-SR16) scores for different 4 week periods.

Four-week period	Sample size		QIDS-SR16 difference	P value	95% CI
	Lamotrigine	Placebo
1-12	101	101	−0.33	.63	−1.02 to 1.69
10-14	81	77	−1.63	.09	−0.24 to 3.50
20-24	62	64	−1.52	.18	−0.73 to 3.77
30-34	52	55	−3.03	.007	0.83 to 5.23
40-44	50	49	−2.09	.08	−0.22 to 4.40
48-52	54	48	−2	.09	−0.34 to 4.35