Table 3 Comparisons of the categories of observed driving behaviours in the ADHD and control groups

1.75

No mirror check when turning

4.95(1.43)

4.00(2.16)

2.88#

No signal when turning

0.00(0.00)

0.05(0.22)

.95

Improperly timed signal

0.67(0.91)

0.71(0.90)

.01

Inadequate observations junction

0.00(0.00)

0.32(0.78)

3.49#

2.16 #

Number of lane changes/overtakings

9.90(5.14)

13.20(6.83)

3.07#

No mirror check when changing lane

0.76(1.14)

2.24(3.03)

3.70#

No signal when changing lane

0.62(1.99)

1.57(2.50)

3.25#

Improperly timed signal changing lane

1.38(2.13)

2.14(3.57)

.01

Over speed limit when overtaking

0.05 (0.22)

0.23 (0.43))

3.48#

1.48

Not slowing with the vehicle ahead

0.00 (0.00)

0.09 (0.29)

2.00

Hesitancy

0.14 (0.36)

0.00 (0.00)

3.53#

Too slow for surrounding traffic

0.05 (0.22)

0.14 (0.47)

.62

Too fast approaching junctions

0.05 (0.22)

0.14 (0.47)

.62

Not slowing after speed sign

2.10 (1.29)

2.64 (1.09)

1.45

1.02

Too close to the kerb

0.10 (0.30)

0.64 (1.50)

2.64

Too far from the kerb/out of lane

0.90 (1.14)

1.23 (1.48)

.64

Driving on the hard shoulder

0.14 (0.36)

0.27 (0.55)

.83

4.28*

Hand off the wheel > 5 s

0.00 (0.00)

0.59 (1.18)

4.43*

Wrong gear

0.38 (0.59)

1.14 (1.64)

5.56*

Stalling

0.24 (0.54)

0.48 (0.98)

.95

.63

Braking too abruptly

0.05 (0.22)

0.14 (.047)

.63

4.65*

Unnecessarily using the horn

0.05 (0.22)

0.36 (1.00)

2.00

Impatience behind stationary/slow traffic

0.00 (0.00)

0.41 (0.67)

7.91**

Responses to events

Χ² statistic

Urban

Crashed (driver’s fault)/ near miss

0.10

0.18

5.52 #

Slowed down/ changed lane

0.74

0.55

Drove past fast

0.16

0.26

Motorway

Did not slow down

0.29

0.25

1.42

Slowed but not below speed limit

0.11

0.19

Slowed below speed limit

0.60

0.57