Table 1 Literature search frequency results by each proxy category

Education

501

280

Occupation

155

91

Leisure activities

76

56

Cognitive activities

131

45

Mood and personality

84

42

Intelligence quotient

72

39

Bilingualism

43

29

Physical activities

59

29

Socioeconomic status

70

29

Physical function

42

24

Social activities

45

21

Nutrition

22

15

Marriage status

17

11

Social network

14

11

Substances

20

9

Parental education

14

8

Social support

13

6

Retirement

27

5

Novelty

4

2

Adverse childhood experiences

3

1

Total

1412

753