Table 3.

The number (n) and proportion (%) of justified CT examinations out of the total number of the cases analysed in 2005 and in 2009 (patients aged <35 years) and the difference between the proportions of justified CTs

CT examination	2005	2009	Change	p-valuec
	n (%)	n (%)	%
Lumbar spinea	7 (23.3)	22 (81.5)	+58	<0.001
Headb	32 (64.0)	22 (73.3)	+9	0.464
Abdomen or upper abdomen	19 (63.3)	24 (80.0)	+17	0.252
Nasal sinuses	24 (80.0)	27 (90.0)	+10	0.472d
Cervical spine	29 (96.7)	29 (96.7)	0	1.000d
Trauma	30 (100.0)	30 (100.0)	0	—
Total	141 (70.5)	154 (87.0)	+17	<0.001

Total number of cases is 30 in all categories except the lumbar spine and head.

^a27 in 2009.

^b50 in 2005.

^cPearson's χ² test.

^dFisher's test.