Table 2

Percentage of correctly answered questions comparing 1992 and 1999, 1992 and 1999 course non-attendees, and 1999 course attendees versus non-attendees

			1992 v 1999 non-course		1999 course v 1999 non-course
Question	1992	1999		1992	1999		Course	Non-course
	% correct	% correct	CI^2-150	% correct	% correct	CI^2-150	% correct	% correct	CI^2-150
	(n = 73)	(n = 91)	p value	(n = 73)	(n = 22)	p value	(n = 69)	(n = 22)	p value
1a	82	97	(5, 24)	82	86	(−13, 21)	100	86	(−1, 28)
1a			0.002			0.463			0.0126
1b	63	76	(1, 27)	63	64	(−22, 24)	80	64	(−6, 38)
1b			0.054			0.583			0.108
1c	45	68	(8, 38)	45	64	(−4.7, 42)	70	64	(−17, 29)
1c			0.003			0.101			0.393
2	52	81	(15, 43)	52	59	(−17, 31)	88	59	(7, 51)
2			<0.0005			0.369			0.004
3	27	60	(19, 47)	27	68	(19, 63)	58	68	(−33, 13)
3			<0.0005			0.001			0.275
4	49	74	(10, 39)	49	59	(−14, 33)	78	59	(−4, 42)
4			0.001			0.288			0.070
5	0	7	(2, 12)	0	5	(−4, 13)	7	5	(−8, 13)
5			0.027			0.232			0.551
6	26	100	(64, 84)	26	100	(64, 84)	100	100	(−10,19)
6			<0.0005			< 0.0005			1.00
7	23	59	(22, 50)	23	46	(−1, 45)	64	46	(−5, 42)
7			<0.0005			0.042			0.102
8	44	79	(21, 49)	44	59	(−8, 39)	86	59	(4, 49)
8			<0.0005			0.155			0.012

↵2-150 95% CI for difference.