Table 1 Baseline characteristics of the cohort

 Gender

Missing

3

(0.91)

Female

301

(90.94)

Male

27

(8.16)

 Age

Missing

13

(3.93)

Median years (IQR)

39 (35–45)

 Ethnicity

Missing

14

(4.23)

Asian

7

(2.11)

Black

10

(3.02)

Mixed

8

(2.42)

White

290

(87.61)

Other

2

(0.60)

 Employment

Missing

14

(4.23)

Full-time parent/care-giver

45

(13.60)

In full-time education

3

(0.91)

Not currently employed

13

(3.93)

Working full-time

77

(23.26)

Working part-time

179

(54.08)

 Education

Missing

14

(4.23)

Up to GCSEs/GCEs/‘O’ levels or equivalent

14

(4.23)

‘A’ levels/NVQs/GNVQs or equivalent

19

(5.74)

First degree/diploma/HNC/HND or equivalent

165

(49.85)

Higher degree (e.g. MSc, PhD) or equivalent

116

(35.05)

No official qualification

3

(0.91)

 Do you have any medical training?

Missing

14

(4.23)

No

251

(75.83)

Yes

66

(19.94)

 Bedrooms per person in household

Median (IQR)

0.88 (0.67–1)

 Smoker in house

No

292

(88.22)

Yes

25

(7.55)

 No. of adults (aged 16+) living in child’s main home

Missing

14

(4.23)

0

1

(0.30)

1

29

(8.76)

2

253

(76.44)

3

23

(6.95)

4+

11

(3.32)

 Age of adults in home

Median years (IQR)

38.5 (35–44)

 Total no. of children in home

Missing

14

(4.23)

1

140

(42.30)

2

149

(45.02)

3

24

(7.25)

4

3

(0.91)

5

1

(0.30)

 Age

Median years (IQR)

4 (2–8)

 Gender

Female

245

(50.52)

Male

240

(49.48)

 Ethnicity

Asian

13

(2.68)

Black

16

(3.30)

Mixed

32

(6.60)

White

419

(86.39)

Other

5

(1.03)

 Does child attend school or day care?

School

261

(53.81)

Day care (3–5 days per week)

78

(16.08)

Day care (1–2 days per week)

81

(16.70)

No (or not that I am aware of)

65

(13.40)