Table 1.

The total number (n) and changes in numbers of different CT examinations performed on patients aged <35 years and on all age groups in 2005 and in 2009 at the Oulu University Hospital, Oulu, Finland

CT examination	<35 years				All age groups
	2005	2009	Change from 2005 to 2009		2005	2009	Change from 2005 to 2009
	n	n	%	pa	n	n	%
Head	1063	843	−21	<0.001	8227	8469	+3
Thorax	241	247	+2	0.786	1809	2032	+12
Lumbar spine	130	27	−79	<0.001	1250	316	−75
Abdomen or upper abdomen	123	143	+16	0.220	1658	2201	+33
Trauma	117	126	+8	0.564	221	251	+14
Cervical spine	110	57	−48	<0.001	362	194	−46
Nasal sinuses	100	79	−21	0.117	369	265	−28
Body (thorax and abdomen)	80	102	+28	0.103	921	1645	+44
Other	403	573	+42	<0.001	2158	3673	+70
Total	2367	2197	−7	0.012	16975	19046	+12

^aχ² goodness of fit test.