Table 3 Relative risks with 95% confidence intervals of RTC of unlicensed drivers stratified by injury severity, 1998-2004.

Sex

n = 147743

n = 1476869

   Male

5.74 (4.98-6.61)

6.57 (5.24-8.25)

   Female

1.0

1.0

Household socioeconomic position

n = 1405498

n = 1405498

n = 1404703

n = 1404703

   High/intermediate level salaried employees

1.0

1.0

1.0

1.0

   Farmer

2.11 (1.70-2.63)

2.08 (1.67-2.58)

2.43 (1.75-3.37)

2.40 (1.73-3.33)

   Self-employed

1.43 (0.89-2.30)

2.04 (1.27-3.29)

2.73 (1.57-4.75)

4.18 (2.40-7.28)

   Assistant non-manual employees

1.62 (1.34-1.96)

1.75 (1.45-2.11)

1.85 (1.39-2.46)

2.00 (1.51-2.66)

   Manual workers

2.02 (1.76-2.32)

2.28 (1.99-2.62)

2.30 (1.86-2.84)

2.60 (2.10-3.22)

   Others

3.49 (2.93-4.15)

3.25 (2.73-3.88)

2.95 (2.21-3.94)

2.72 (2.04-3.63)

Receipt of welfare benefits

n = 1477743

n = 1477743

n = 1476869

n = 1476869

   Yes

2.97 (2.68-3.28)

2.21 (1.99-2.44)

2.52 (2.16-2.94)

1.81 (1.55-2.12)

   No

1.0

1.0

1.0

1.0

Urbanicity³

n = 1472083

n = 1472083

n = 1471215

n = 1471215

   Metropolitan areas

1.0

1.0

1.0

1.0

   Large urban areas

0.96 0.85-1.08

1.14 1.01-1.28

1.24 (1.02-1.50)

1.50 (1.24-1.83)

   Medium-sized urban areas

0.91 0.78-1.06

1.20 1.03-1.40

1.30 (1.03-1.64)

1.76 (1.39-2.23)

   Small urban areas

0.96 0.76-1.40

1.30 1.03-1.64

1.41 (1.00-1.98)

1.97 (1.40-2.77)

   Rural areas

1.14 0.92-1.40

1.71 1.38-2.11

2.09 (1.57-2.79)

3.29 (2.47-4.39)