Table 1.

Description of studies identified by the search that were included in the systematic review

Study	Year	Location	Design	Injury Type	Cases	Controls	Age	Sex	Covariates Included
Smith et al. (Smith et al., 2001)	2001	United States	Case-control	Boating	221	3943	43.5	Both	1, 2, 3, 4, 5, 6, 7
Haworth et al.(Haworth, 2000)	2000	Australia	Case-control	MVA*	114	847	27.5	Both	1, 2, 5, 6
Keall et al. (Keall et al., 2004)	2004	New Zealand	Case-control	MVA	85	85, 163	15+**	Both	CE***
Zador et al. (M:16–20) (Zador et al., 2000)	2000	United States	Case-control	MVA	432	609	16–20	Men	CE
Zador et al. (M:21–34) (Zador et al., 2000)	2000	United States	Case-control	MVA	1040	1652	21–34	Men	CE
Zador et al. (M:35+) (Zador et al., 2000)	2000	United States	Case-control	MVA	659	1508	35+	Men	CE
Zador et al. (F:16–20) (Zador et al., 2000)	2000	United States	Case-control	MVA	89	322	16–20	Women	CE
Zador et al. (F:21–34) (Zador et al., 2000)	2000	United States	Case-control	MVA	191	762	21–34	Women	CE
Zador et al. (F:35+) (Zador et al., 2000)	2000	United States	Case-control	MVA	134	702	35+	Women	CE
Evans & Frick (Evans and Frick, 1993b)	1993	United States	Case-control	MVA	307	1149	N/A*	Both	CE

^*MVA = motor vehicle accident

^**not reported or estimable

^***CE = crude estimate only, unadjusted

Covariates: 1: age, 2: sex, 3:race 4: other occupants 5: time of day 6: location 7:weekday/weekend