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Table 4 Score on the CES-D Scale and prevalence of high depressive symptoms after imputation of the values for items considered as qualitative variables, according to various scenarios of nonignorable missing data

From: Dealing with missing data in the Center for Epidemiologic Studies Depression self-report scale: a study based on the French E3N cohort

  

Parsimonious model

Full model

  

Score on the CES-D scale

Score on the CES-D scale

 

N

Mean

SD

≥16 (%)

Mean

SD

≥16 (%)

Scenario 1

     

θa = (1.2; 1.5; 2.0) for all items

     

 0 - 20 MV

71,412

13.43

9.18

32.49

13.47

9.19

32.71

 0 - 10 MV

62,053

12.84

8.77

30.05

12.84

8.77

30.07

 0 - 4 MV

59,562

12.52

8.50

28.81

12.53

8.50

28.83

Scenario 2:

   

θa = (1.2; 1.5; 2.0) for N items, θa = (1.5; 2.0; 2.5) for P items

 0 - 20 MV

71,412

13.45

9.18

32.57

13.50

9.19

32.79

 0 - 10 MV

62,053

12.85

8.77

30.07

12.85

8.77

30.10

 0 - 4 MV

59,562

12.53

8.50

28.82

12.53

8.50

28.84

Scenario 3

   

θa = (2.0; 3.0; 5.0) for N items, θa = (3.0; 5.0; 8.0) for P items

 0 - 20 MV

71,412

13.88

9.37

34.41

13.92

9.39

34.66

 0 - 10 MV

62,053

12.97

8.82

30.58

12.98

8.82

30.59

 0 - 4 MV

59,562

12.62

8.52

29.12

12.62

8.52

29.19

Scenario 4

θa = (4.0; 6.0; 10.0) for N items, θa = (6.0; 10.0; 15.0) for P items

 0 - 20 MV

71,412

14.19

9.47

36.17

14.24

9.50

36.39

 0 - 10 MV

62,053

13.06

8.84

30.98

13.06

8.84

30.98

 0 - 4 MV

59,562

12.68

8.52

29.42

12.68

8.52

29.44

  1. Abbreviations: MV, Missing value; N items, negative items; P items, positive items.
  2. a: Vector of parameters for the MNAR scenario, each parameter corresponding to the odds ratio expressing the excess risk to respond one of the response categories (i.e. an item score of one, two or three) compared to the reference (i.e. an item score of zero), in subjects with MV compared to subjects without MV.