Table 5.

Classification of risk for the BCRAT risk score and the combined risk score, overall and stratified by age group

	Combined risk score
	Cases			Controls
BCRAT risk score	<1.5%	≥1.5% and <2.0%	≥2.0%	<1.5%	≥1.5% and <2.0%	≥2.0%
Overall
<1.5%	769	66	17	411	18	5
≥1.5% and <2.0%	21	29	20	6	10	5
≥2.0%	2	9	29	0	1	7
Aged 35 to 39 years
<1.5%	323	7	1	182	0	0
≥1.5% and <2.0%	1	1	0	0	0	0
≥2.0%	0	0	0	0	0	0
Aged 40 to 49 years
<1.5%	267	22	4	139	4	1
≥1.5% and <2.0%	7	12	9	4	2	1
≥2.0%	0	0	1	0	0	0
Aged 50 to 59 years
<1.5%	179	37	12	90	14	4
≥1.5% and <2.0%	13	16	11	2	8	4
≥2.0%	2	9	28	0	1	7