Table 1 Characteristics of the Generation Scotland: Scottish Family Health Study cohort (n=18 337)

From: Differential effects of the APOE e4 allele on different domains of cognitive ability across the life-course

 

Mean

SD

Age (years)

47.2

15.0

Educationa

4.7

1.6

Cognitive (number of correct items)

 DST

72.3

171

 VFT

39.8

11.7

 MHVS

30.1

4.7

 LM

31.1

7.9

 

Median

IQR

SIMD

4342

2370–3910

 

n

%

APOE

 e2e2

111

0.6

 e2e3

2194

12.0

 e2e4

411

2.2

 e3e3

10 926

59.6

 e3e4

4226

23.1

 e4e4

469

2.6

 Sex (male)

7506

40.9

 Heart disease (yes)

638

3.5

 Stroke (yes)

232

1.3

 High blood pressure (yes)

2421

13.2

 Diabetes (yes)

570

3.1

 Alzheimer's disease (yes)

23

0.1

 Depression (yes)

1752

9.6

  1. Abbreviations: DST, Digit Symbol Test; LM, logical memory; MHVS, Mill Hill Vocabulary Scale; VFT, Verbal Fluency Test.
  2. aEducation was measured as an ordinal variable (n=17 687). 0: 0 years (n=7), 1: 1–4 years (n=51), 2: 5–9 years (n=510), 3: 10–11 years (n=4781), 4: 12–13 years (n=3858), 5: 14–15 years (n=2594), 6: 16–17 years (n=3525), 7: 18–19 years (n=1727), 8: 20–21 years (n=445), 9: 22–23 years (n=127), 10: ≥24 years (n=62).
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