Table 2. Aggregate Mean New Scenario Scores and Score Changes by Arm and Time.

	Percentage of Points Correct			Absolute Change in Percentage of Points Correct
	(95% CI)			(95% CI), p-value
	t0	t1	t2	t0–t1	t1–t2	t0–t2
OSS arm	37.4	49.5	49.0	+12.1	−0.6	+11.5
	(34.3,40.6)	(46.4,52.7)	(45.8,52.2)	(9.6,14.6), p<0.001	(−3.1,1.9), p = 0.647	(9.0,14.1), p<0.001
Control arm	41.2	48.7	50.2	+7.5	+1.6	+9.1
	(38.0,44.4)	(45.5,51.8)	(47.0,53.4)	(5.0,10.0), p<0.001	(−1.0,4.1), p = 0.225	(6.5,11.6), p<0.001
Both arms	39.3	49.1	49.6	+9.8	+0.5	+10.3
combined	(37.1,41.5)	(46.9,51.3)	(47.4,51.9)	(8.0,11.6), p<0.001	(−1.3,2.3), p = 0.594	(8.5,12.1), p<0.001

Abbreviations. t0: Pretest (baseline); t1: End of 3-week core course; t2: End of 2^nd boost course (24 weeks after t1).