Table 1

Distribution of descriptive characteristics and road traffic deaths for 611 654 Norwegians born between 1967 and 1976 and followed-up from age 16 to 20 years

Characteristic	No.	%	No. of deaths	Rate^*
Individual level variables
Gender
Females	298 466	48.8	149	10.0
Males	313 188	51.2	527	33.8
Year of birth
1967–68	130 136	21.3	192	29.6
1969–70	129 069	21.1	172	26.7
1971–72	126 588	20.7	123	19.5
1973–74	118 038	19.3	101	17.2
1975–76	107 339	17.6	88	16.5
Parental education level
Tertiary, high (class level 17+)	42 811	7.0	22	10.3
Tertiary, low (class level 14–16)	110 226	18.0	70	12.7
Upper secondary, complete (class level 12–13)	121 336	19.8	133	22.0
Upper secondary, basic (class level 10–11)	244 193	39.9	295	24.3
Lower secondary or less (class level 0–9)	91 246	14.9	153	33.7
Missing	1842	0.3	3	33.7
Father's income quartile
Highest	142 255	23.3	124	17.5
Third	142 274	23.3	147	20.8
Second	142 319	23.3	158	22.3
Lowest	142 283	23.3	188	26.5
Missing	42 523	7.0	59	28.4
Mother's marital status
Married	501 622	82.0	527	21.1
Unmarried	102 728	16.8	135	26.4
Missing	7304	1.2	14	38.5
Municipal level variables (six missing)
Proportion high-income earners (quartiles)^†
0.280–0.402	152 280	24.9	97	12.8
0.224–0.279	152 903	25.0	152	19.9
0.177–0.223	153 955	25.2	196	25.6
0.024–0.176	152 510	24.9	231	30.4
Urbanisation^‡
Urban	506 080	82.7	515	20.5
Rural	105 568	17.3	161	30.6

↵* Deaths per 100 000 person-years.
↵† Proportion of income earners who paid surtax to the state in 2000.
↵‡ The municipality's geographical position in relation to an urban settlement.