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Table 1 Baseline comparison: Covariates by exposure to BIB

From: Does involvement in a cohort study improve health and affect health inequalities? A natural experiment

 

BIB P1s (unexposed)

N = 1,411

BIB P2s (exposed)

N = 225

Age in years

Mean (SD)

29.60 (4.63)

28.28 (4.64)

Ethnicity (%)

White British

32.24

28.89

Pakistani

54.69

59.11

Other

13.07

12.00

Education (%)

<5 GCSEs

24.11

24.44

5 GCSEs

33.93

36.00

A-levels

13.73

10.67

Higher than A-level

20.27

24.44

Other

7.97

4.44

Questionnaire date

Mean (SD)

659.98 (384.71)

999.48 (237.66)

Any alcohol (%)

Yes

53.82

33.33

No

46.18

66.67

Alcohol – 5 units or more (%)

Yes

25.00

25.00

No

75.00

75.00

Smoking (%)

Yes

15.13

12.50

No

84.87

87.50

Vitamin D (%)

Yes

15.10

9.33

No

84.90

90.67

Caffeine (%)

Yes

61.30

59.11

No

38.70

40.89

Birth weight (grams)

Mean (SD)

3268.28 (534.16)

3315.04 (496.00)