Table 1 Distribution of activity codes across common categories of external causes of injury, NSW hospitalization episodes, 2003–04

ICD external cause	Codes	Total number of cases assigned to ICD code range	Sports/leisure activity code n (%)	Unspecified activity code n (%)	Missing activity code n (%)	Not sports/leisure activity code n (%)
Overexertion and strenuous or repetitive movements	X50	4854	1938 (39.9)	596 (12.3)	20 (0.4)	2300 (47.4)
Drowning	W65–W74, V90, V91, V21	346	131 (37.9)	68 (19.7)	0 (0)	147 (42.5)
Struck by/against	W20–W23, W50–W52	11400	3805 (33.4)	2296 (20.1)	25 (0.2)	5274 (46.3)
Transport accidents	V01–V99	28998	4308 (14.9)	9403 (32.4)	125 (0.4)	15162 (52.3)
Fall	W00–W19	71879	10510 (14.6)	21581 (30.0)	281 (0.4)	36507 (55.0)
Exposure to unknown factor	X59	19708	2790 (14.2)	7666 (38.9)	230 (1.1)	9022 (45.8)
Others	All other codes	45766	1864 (4.1)	12718 (27.8)	854 (1.9)	30330 (66.3)

Total		182951	25346 (13.9)	54328 (29.7)	1535 (0.8)	101742 (55.6)