n | % | Mean (SD) | |||||
Age (years) | 4146 | 54.8 (5.69) | |||||
Sex | |||||||
Male | 2989 | 72 | |||||
Female | 1157 | 28 | |||||
Employment grade level (phase 5/phase 7) | |||||||
1 Senior administrators (highest grade) | 889/1073 | 22/26 | |||||
2 | 996/889 | 24/22 | |||||
3 | 592/629 | 14/15 | |||||
4 | 693/641 | 17/15 | |||||
5 | 508/491 | 12/12 | |||||
6 Clerical/support (lowest grade) | 463/397 | 11/10 | |||||
Missing | 5/26 | −/1 | |||||
Smoking | |||||||
Never or former smokers | 3770 | 91 | |||||
Current smokers | 342 | 8 | |||||
Missing | 34 | 1 | |||||
Alcohol consumption (units of alcohol/week) | |||||||
None | 567 | 14 | |||||
1–14 units/week | 2053 | 50 | |||||
15–21 units/week | 595 | 14 | |||||
22 units/week or over | 825 | 20 | |||||
Missing | 106 | 2 | |||||
Body mass index (kg/m2) | 4141 | 26.2 (8.50) | |||||
Under 18.5 | 61 | 2 | |||||
18.5–25 | 2610 | 63 | |||||
25–30 | 1272 | 32 | |||||
Over 30 | 198 | 5 | |||||
Depression | |||||||
No | 3360 | 81 | |||||
Yes | 786 | 19 | |||||
Hypertension | |||||||
No | 2521 | 61 | |||||
Yes | 1623 | 39 | |||||
Missing | 2 | ||||||
Phases 1–3 | |||||||
High-strain job over three phases | |||||||
No exposure | 2513 | 61 | |||||
One exposure | 1013 | 24 | |||||
Two exposures | 458 | 11 | |||||
Three exposures | 162 | 4 | |||||
Active job over three phases | |||||||
No exposure | 1804 | 44 | |||||
One exposure | 940 | 23 | |||||
Two exposures | 718 | 17 | |||||
Three exposures | 684 | 16 | |||||
Phase 5 cognitive functions | |||||||
Verbal memory | 4146 | 7.0 (2.39) | |||||
Inductive reasoning (AH4) | 4146 | 47.5 (10.67) | |||||
Verbal meaning (Mill Hill) | 4146 | 25.2 (4.33) | |||||
Phonemic fluency | 4146 | 17.1 (4.43) | |||||
Semantic fluency | 4146 | 16.7 (4.19) | |||||
Phase 7 cognitive functions | |||||||
Verbal memory | 4146 | 6.9 (2.41) | |||||
Inductive reasoning (AH4) | 4144 | 44.7 (10.87) | |||||
Verbal meaning (Mill Hill) | 4136 | 25.1 (4.32) | |||||
Phonemic fluency | 4126 | 16.0 (4.17) | |||||
Semantic fluency | 4138 | 15.9 (3.87) |
*Characteristics as at phase 5, unless otherwise stated.
AH4, Alice Heim intelligence test.