Table 3 Univariate effects of different predictors of participation upon respondent retention at ages 16, 18 and 20 (as expected from the literature, all the predictors were significant, except for receiving the SHARE teacher-delivered sex education at school)

All pupils (N = 8430)

Sex

female

1.94

(1.76, 2.13)

2.65

(2.42, 2.91)

2.37

(2.16, 2.61)

male

1

1

1

Father manual versus non manual worker

non-manual

2.27

(2.01, 2.58)

1.49

(1.34, 1.66)

1.32

(1.18, 1.48)

missing data

0.60

(0.54, 0.67)

0.82

(0.73, 0.92)

0.78

(0.70, 0.88)

manual

1

1

1

Mother manual versus non manual worker

non-manual

1.99

(1.76, 2.26)

1.34

(1.19, 1.51)

1.26

(1.11, 1.42)

missing data

0.69

(0.61, 0.77)

0.79

(0.70, 0.89)

0.78

(0.69, 0.89)

manual

1

1

1

Family composition

lives with mum only

0.53

(0.47, 0.59)

0.80

(0.72, 0.89)

0.74

(0.66, 0.82)

lives with dad only

0.40

(0.32, 0.51)

0.48

(0.36, 0.63)

0.45

(0.34, 0.61)

lives with neither parent

0.31

(0.21, 0.46)

0.41

(0.25, 0.67)

0.55

(0.34, 0.89)

missing data

0.03

(0.02, 0.05)

0.23

(0.16, 0.31)

0.26

(0.19, 0.37)

lives with both parents

1

1

1

Parental monitoring

low parental monitoring

0.69

(0.63, 0.76)

0.63

(0.57, 0.69)

0.69

(0.63, 0.76)

high parental monitoring

1

1

1

Pocket Money

more than £20 per week

0.87

(0.8, 0.89)

0.89

(0.87, 0.90)

less than £20 per week

N/A*

1

1

Sexual intercourse by 16 years*

has had sexual intercourse

0.91

(0.81, 1.01)

0.87

(0.78, 0.98)

missing data

0.26

(0.23, 0.29)

0.30

(0.27, 0.34)

has not had sexual intercourse

N/A*

1

1

Early school leaving status

leavers

0.15

(0.14, 0.17)

0.55

(0.50, 0.62)

0.65

(0.58, 0.73)

non-leavers

1

1

1

Drunkenness

gets drunk once a month or more

N/A*

0.74

(0.67, 0.81)

0.81

(0.73, 0.90)

never or rarely gets drunk

1

1

The SHARE teacher delivered sex education intervention

Received SHARE

0.91

(0.82, 1.01)

0.92

(0.84, 1.01)

0.92

(0.84, 1.01)

Not received SHARE

1

1

1