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Table 1 Overview of features with more than 5% missing values

From: Importance of medical data preprocessing in predictive modeling and risk factor discovery for the frailty syndrome

Feature

Percentage of missing data

Reason for missingness

Imputation possible

Times stopped smoking

75.11

MNAR (follow-up question)

No

Daily wine consumption

91.14

MNAR (follow-up question)

No

Daily beer consumption

98.73

MNAR (follow-up question)

No

Daily spirits consumption

98.95

MNAR (follow-up question)

No

Duration of alcohol consumption

82.91

MNAR (follow-up question)

No

Earlier alcohol consumption

19.20

MAR

Yes

Kind of drinker (earlier)

86.29

MNAR (follow-up question)

No

Starting age alcohol consumption

86.50

MNAR (follow-up question)

No

Ending age alcohol consumption

86.92

MNAR (follow-up question)

No

D Dimer [ μg/L]

17.72

MAR

Yes

High-sensitivity C-reactive protein (hs-CRP) [mg/L]

14.98

MAR

Yes

Number of IADL abilities

6.33

MAR

Yes

Total MMSE score

15.82

MAR

Yes

Total GDS

9.49

MAR

Yes

Depression

9.49

related to {gdstotal}

No

Insulin [U/mL]

11.60

MAR

Yes

HDL

9.07

MAR

Yes

LDL

9.07

MAR

Yes

Total testosterone [ng/dL]

37.97

MAR

Yes

Free testosterone [ng/dL]

37.97

MAR

Yes

Mobility scale question 5

8.44

MNAR (follow-up question)

No

Mobility scale question 6

8.44

MNAR (follow-up question)

No

Mobility scale question 8

14.35

MNAR (follow-up question)

No

Mobility scale question 9

13.92

MNAR (follow-up question)

No

Mobility scale question 11

7.81

MNAR (follow-up question)

No

Mobility scale question 12

7.59

MNAR (follow-up question)

No

Mobility scale question 14

25.95

MNAR (follow-up question)

No

Mobility scale question 15

26.16

MNAR (follow-up question)

No

MMSE temporal domain 1

17.93

MAR

Yes

MMSE temporal domain 2

18.78

MAR

Yes

MMSE temporal domain 3

18.14

MAR

Yes

MMSE temporal domain 4

22.57

MAR

Yes

MMSE temporal domain 5

12.87

MAR

Yes

MMSE spatial domain 1

13.08

MAR

Yes

MMSE spatial domain 2

13.29

MAR

Yes

MMSE spatial domain 3

13.29

MAR

Yes

MMSE spatial domain 4

13.29

MAR

Yes

MMSE spatial domain 5

13.29

MAR

Yes

MMSE remembering 1

18.99

MAR

Yes

MMSE remembering 2

19.41

MAR

Yes

MMSE backward counting

51.05

MAR

Yes

MMSE spell the word

61.60

MAR

Yes

MMSE object naming

13.92

MAR

Yes

MMSE repeat phrase

13.08

MAR

Yes

MMSE left right

13.50

MAR

Yes

MMSE following written order

13.29

MAR

Yes

MMSE write sentence

13.92

MAR

Yes

MMSE copying design

13.50

MAR

Yes

Cognitive impairment

17.09

MAR

Yes

Individual income

8.44

MAR

Yes

Household income

13.29

MAR

Yes

Number of persons in the family

18.78

MAR

Yes

Insulin like growth factor 1 (IGF1) [ng/mL]

27.00

MAR

Yes

Dementia type

98.73

MNAR (follow-up question)

No

Overall income

13.71

MAR

Yes

  1. Features where more than one third of the values are missing are presented in bold