Table 2.

Knowledge scores by ethnicity, social class; age and gender

		KNOWLEDGE SCORE
		0	1	2	3–4	5–6	Mean score	SD	p-value*
Ethnicity
White	N	235	30	13	13	14	0.61	1.416
	%	77.0	9.8	4.3	4.3	4.6
Non-White	N	105	4	1	2	3	0.26	1.035	0.001
	%	91.3	3.5	0.9	1.7	2.6
Social Class
Non-manual (I-IIIN)	N	128	22	8	12	15	0.90	1.745
	%	69.2	11.9	4.3	6.5	8.1
Manual (IIIM-V)	N	212	12	6	3	2	0.20	0.742	<0.001
	%	90.2	5.1	2.6	1.3	0.9
Age
16–24	N	96	8	3	2	1	0.25	0.826
	%	87.3	7.3	2.7	1.8	0.9
24–34	N	73	9	3	4	2	0.44	1.128
	%	80.2	9.9	3.3	4.4	2.2
34–44	N	104	7	4	5	6	0.52	1.390
	%	82.5	5.6	3.2	4.0	4.8
44–54	N	67	10	4	4	8	0.86	1.779	0.034
	%	72.0	10.8	4.3	4.3	8.6
Gender
Male	N	136	12	3	4	4	0.35	1.091
	%	85.5	7.5	1.9	2.5	2.5
Female	N	204	22	11	11	13	0.61	1.450	0.05
	%	78.2	8.4	4.2	4.2	5.0

* derived from Kruskall-Wallis test for age; Mann-Whitney U test for other factors