Table 2 Risk ratios 95% confidence intervals unintentional injuries in highest versus lowest income quintiles analysis

 First (refer: highest)

Ref

–

–

< 0.001

Ref

–

–

 Second

1.12

0.99

1.25

1.08

0.96

1.22

 Third

1.19

1.06

1.33

1.11

0.98

1.26

 Fourth

1.22

1.07

1.38

1.09

0.95

1.26

 Fifth (Lowest)

1.27

1.13

1.43

1.15

0.996

1.34

 Child’s sex (Ref: female)

1.22

1.14

1.31

< 0.001

1.22

1.13

1.32

 Child ethnic group (Ref: White)

0.74

0.66

0.82

< 0.001

0.79

0.68

0.91

 35+ years

Ref

–

–

< 0.001

Ref

–

–

 25–34 years

0.69

0.5

0.93

1.07

0.92

1.25

 20–24 years

0.84

0.76

0.93

0.95

0.82

1.11

 14–19 years

0.99

0.88

1.11

0.77

0.55

1.09

 MCS lone child

Ref

–

–

0.01

Ref

–

–

 2/3 children

1.1

1.03

1.17

1.10

1.01

1.20

 4 or more children

1.11

0.99

1.25

1.22

1.04

1.44

 Safe areas to play at home at 9 months (Ref: No safe areas)

1.06

0.99

1.12

0.08

1.00

0.92

1.08

 None

Ref

–

–

0.04

Ref

–

–

 1 piece

1.13

0.87

1.47

1.15

0.79

1.66

 2 pieces

1.28

1.01

1.63

1.25

0.9

1.74

 3 pieces

1.32

1.04

1.67

1.36

0.98

1.89

 4 pieces

1.34

1.06

1.7

1.36

0.98

1.90

 5 pieces

1.33

1.04

1.71

1.36

0.97

1.92

 Access to a garden at 9 months (Ref: No access)

1.05

0.91

1.21

0.49

–

–

–

 None (parents look after child)

Ref

–

–

0.09

Ref

–

–

 Registered childcare provider

0.91

0.83

1

0.99

0.89

1.10

 Non-registered childcare provider (e.g. family, friends)

0.94

0.85

1.04

1.03

0.91

1.17

 Household pets MCSc age 3 (ref: No pets)

1.14

1.07

1.21

< 0.001

1.04

0.97

1.12

 Household smoking MCSc age 3 (ref: None)

1.15

1.05

1.26

< 0.001

1.01

0.90

1.13

 Poor home safety (HOME score) MCSc age 3

1.20

0.93

1.55

0.17

–

–

–

 Responder feels unsafe in area MCSc age 3

1.12

1.03

1.22

0.01

1.08

0.98

1.19

 Very organised

Ref

–

–

< 0.001

Ref

–

–

 Organised

1.09

1

1.18

1.05

0.95

1.15

 Average

1.15

1.02

1.29

1.11

0.98

1.27

Disorganised

1.16

1.02

1.31

1.06

0.92

1.22

Very disorganised

1.61

1.32

1.95

1.35

1.09

1.67

Maternal distress at 3 yrs. (Ref: Kessler < 5)

1.33

1.12

1.59

0.01

1.18

0.94

1.47

Limiting long term condition MCSc age 3 (Ref: none)

1.16

1.07

1.26

< 0.001

1.08

0.98

1.19

None

Ref

–

–

0.58

–

–

–

1–6 units

0.98

0.92

1.05

–

–

–

7–14 units

1.04

0.93

1.16

–

–

–

15 or more units⁺

1.1

0.92

1.32

–

–

–

Approach to parenting MCSc age 3 (Ref: Unstructured)

1

0.93

1.06

0.71

–

–

–

Both

Ref

–

–

0.19

–

–

–

Family only

1.06

0.95

1.17

–

–

–

Friends only

0.95

0.89

1.02

–

–

–

Neither nearby

1.00

0.91

1.11

–

–

–

Average

Ref

–

–

< 0.001

Ref

–

–

Borderline

0.06

1.03

1.26

1.05

0.93

1.19

Below average

1.32

1.19

1.46

1.16

1.03

1.32

Sight concerns, MCSc age 3

1.02

0.9

1.15

0.75

–

–

–

Hearing concerns, MCSc age 3

1.08

0.95

1.23

0.24

–

–

–

Child is NOT school ready, MCSc age 3

0.91

0.82

1.00

0.06

1.06

0.96

1.18