The Scottish Government

Baseline - 2 ^nd Survey

Baseline - 3 ^rd Survey

Baseline - 4 ^th Survey

Base: All matching between baseline and follow-up surveys
(+3 Approve strongly - -3 Disapprove strongly)

Mean

Std Devn

Paired Differences

Mean

Std Devn

Paired Differences

Mean

Std Devn

Paired Differences

How much would … approve or disapprove if you drove at 40mph down this road?

The police

-2.74
-2.77

0.74
0.66

t=0.600, df=387
ns

-2.75
-2.75

0.70
0.59

t=0.064, df=366
ns

-2.77
-2.78

0.70
0.58

t=0.075, df=286
ns

A competent driver

-1.74
-1.73

1.44
1.32

t=-0.127, df=387
ns

-1.71
-1.77

1.47
1.26

t=0.756, df=366
ns

-1.76
-1.90

1.49
1.22

t=1.516, df=286
ns

Your mother

-1.69
-1.60

1.32
1.33

t=-1.357, df=387
ns

-1.71
-1.60

1.33
1.31

t=-1.322, df=366
ns

-1.71
-1.47

1.37
1.30

t=-2.562, df=286
p<0.05

Your partner / spouse

-1.41
-1.28

1.49
1.50

t=-1.585, df=387
ns

-1.42
-1.35

1.46
1.42

t=-0.948, df=366
ns

-1.52
-1.53

1.44
1.33

t=0.123, df=286
ns

Your father

-1.31
-1.15

1.38
1.39

t=-2.082, df=387
p<0.05

-1.32
-1.20

1.39
1.34

t=-1.448, df=366
ns

-1.42
-1.23

1.39
1.34

t=-2.012, df=286
p<0.05

Your passengers

-0.98
-1.00

1.39
1.34

t=0.251, df=387
ns

-0.95
-0.94

1.43
1.34

t=-0.130, df=366
ns

-1.04
-1.08

1.45
1.33

t=0.466, df=286
ns

Your closest friends

-0.87
-0.75

1.50
1.39

t=-1.543, df=387
ns

-0.81
-0.90

1.53
1.39

t=1.122, df=366
ns

-0.89
-0.98

1.55
1.33

t=1.060, df=286
ns

Your children

-0.83
-0.90

1.45
1.39

t=1.005, df=387
ns

-0.86
-0.89

1.46
1.32

t=0.378, df=366
ns

-0.98
-0.90

1.52
1.40

t=-0.847, df=286
ns

Your boss

-0.60
-0.66

1.30
1.25

t=0.799, df=387
ns

-0.62
-0.78

1.28
1.29

t=2.070, df=366
p<0.05

-0.71
-0.85

1.36
1.31

t=1.529, df=286
ns

People you work with

-0.52
0.53

1.25
1.18

t=0.189, df=387
ns

-0.49
-0.69

1.26
1.21

t=2.985, df=366 p<0.01

-0.54
-0.74

1.35
1.27

t=2.222, df=286
p<0.05

A typical young male driver

1.20
1.24

1.76
1.51

t=-0.342, df=387
ns

1.19
1.15

1.76
1.51

t=0.348, df=366
ns

1.05
1.16

1.80
1.55

t=-0.881, df=286
ns

Baseline - 2 ^nd Survey

Baseline - 3 ^rd Survey

Baseline - 4 ^th Survey

Base: All matching between baseline and follow-up surveys
(+7 Agree strongly - +1 Disagree strongly)

Mean

Std Devn

Paired Differences

Mean

Std Devn

Paired Differences

Mean

Std Devn

Paired Differences

I generally like to drive in a way which … would approve of

The police

5.84
5.75

1.29
1.19

t=1.480, df=387
ns

5.75
5.72

1.37
1.19

t=0.420, df=366
ns

5.81
5.79

1.34
1.13

t=0.310, df=286
ns

A competent driver

5.86
5.80

1.25
1.07

t=0.888, df=387
ns

5.77
5.80

1.32
1.09

t=-0.467, df=366
ns

5.82
5.75

1.29
1.12

t=0.972, df=286
ns

My mother

4.96
4.95

1.72
1.65

t=0.091, df=387
ns

4.94
5.05

1.73
1.61

t=-1.147, df=366
ns

5.02
4.98

1.69
1.59

t=0.404, df=286
ns

My partner / spouse

5.01
5.02

1.73
1.67

t=-0.083, df=387
ns

4.96
5.23

1.73
1.53

t=-2.978, df=366 p<0.01

5.14
5.28

1.68
1.53

t=-1.403, df=286
ns

My father

4.83
4.86

1.70
1.57

t=-0.396, df=387
ns

4.76
4.99

1.73
1.53

t=-2.618, df=366 p<0.01

4.87
4.99

1.72
1.54

t=-1.185, df=286
ns

My passengers

5.46
5.45

1.58
1.49

t=0.092, df=387
ns

5.44
5.52

1.52
1.38

t=-0.932, df=366
ns

5.51
5.49

1.50
1.50

t=0.172, df=286
ns

My closest friends

5.11
5.09

1.61
1.49

t=0.192, df=387
ns

5.10
5.30

1.62
1.47

t=-2.366, df=366 p<0.05

5.22
5.36

1.55
1.40

t=-1.580, df=286
ns

My children

5.12
5.02

1.46
1.46

t=1.442, df=387
ns

5.05
5.09

1.48
1.41

t=-0.541, df=366
ns

5.12
5.08

1.50
1.47

t=0.456, df=286
ns

My boss

4.65
4.67

1.42
1.49

t=-0.191, df=387
ns

4.65
4.82

1.45
1.39

t=-2.093, df=366 p<0.05

4.80
4.74

1.44
1.43

t=0.676, df=286
ns

People I work with

4.78
4.79

1.51
1.44

t=-0.117, df=387
ns

4.74
4.87

1.54
1.41

t=-1.565, df=366
ns

4.91
4.95

1.46
1.35

t=-0.401, df=286
ns

A typical young male driver

2.68
2.61

1.80
1.58

t=0.650, df=387
ns

2.66
2.76

1.81
1.62

t=-0.923, df=366
ns

2.72
2.56

1.90
1.55

t=1.246, df=286
ns

Baseline - 2 ^nd Survey

Baseline - 3 ^rd Survey

Baseline - 4 ^th Survey

Base: All matching between baseline and follow-up surveys
Subjective norms i=normative belief i x motivation to comply i
Strongly disapprove (-3) x Strongly disagree (+1)
Strongly approve (+3) Strongly agree (+7)

Mean

Std Devn

Paired Differences

Mean

Std Devn

Paired Differences

Mean

Std Devn

Paired Differences

I generally like to drive in a way which … would approve of

The police

-16.09
-16.01

5.76
5.22

t=-0.254, df=387
ns

-15.86
-15.83

5.71
4.97

t=-0.112, df=366
ns

-16.19
-16.20

5.64
4.82

t=0.031, df=286
ns

A competent driver

-10.47
-10.37

9.27
8.47

t=-0.197, df=387
ns

-10.23
-10.65

9.31
7.98

t=0.806, df=366
ns

-10.49
-11.24

9.51
7.93

t=1.353, df=286
ns

Mother

-8.90
-8.38

8.11
8.03

t=-1.242, df=387
ns

-8.93
-8.63

8.19
8.02

t=-0.634, df=366
ns

-9.14
-8.09

8.35
8.13

t=-1.911, df=286
ns

Partner / spouse

-7.67
-7.15

8.48
8.74

t=-1.177, df=387
ns

-7.70
-7.85

8.37
8.42

t=0.360, df=366
ns

-8.51
-8.80

8.48
8.26

t=0.621, df=286
ns

Father

-6.88
-6.17

8.08
8.18

t=-1.720, df=387
ns

-6.74
-6.76

8.17
7.97

t=0.035, df=366
ns

-7.37
-6.92

8.33
8.26

t=-0.849, df=286
ns

Passengers

-5.65
-5.76

8.32
8.04

t=0.225, df=387
ns

-5.56
-5.40

8.42
8.07

t=-0.315, df=366
ns

-6.06
-6.43

8.67
8.12

t=0.629, df=286
ns

Closest friends

-5.21
-4.25

8.52
7.80

t=-2.241, df=387
p<0.05

-4.83
-5.30

8.73
8.36

t=1.107, df=366
ns

-5.44
-5.78

8.89
8.06

t=0.684, df=286
ns

Children

-5.23
-5.42

8.82
8.44

t=0.440, df=387
ns

-5.32
-5.51

8.73
8.18

t=0.445, df=366
ns

-6.04
-5.62

9.17
8.65

t=-0.746, df=286
ns

Boss

-3.78
-3.86

7.57
7.40

t=0.187, df=387
ns

-3.88
-4.64

7.56
7.76

t=1.755, df=366
ns

-4.50
-4.76

7.99
7.75

t=0.519, df=286
ns

People work with

-3.24
-3.16

7.24
6.87

t=-0.210, df=387
ns

-3.12
-4.06

7.38
7.23

t=2.408, df=366 p<0.05

-3.65
-4.43

7.90
7.67

t=1.572, df=286
ns

A typical young male driver

2.66
2.95

6.04
4.74

t=-0.842, df=387
ns

2.66
2.71

6.04
4.92

t=-0.148, df=366
ns

2.28
2.44

6.42
4.93

t=-0.374, df=286
ns

Composite Subjective Norms

-70.48
-67.59

55.71
53.45

t=-1.138, df=387
ns

-69.51
-71.91

56.42
55.44

t=0.891, df=366
ns

-75.11
-75.82

59.72
56.08

t=0.232, df=286
ns