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Table 3 Comparison of results from three methods of regression analysis (Change in EQ5D)

From: Do the methods used to analyse missing data really matter? An examination of data from an observational study of Intermediate Care patients

  

OLS on complete cases n = 688 [1]a

OLS on MI dataset n = 1105 cases [2]b

Heckman on complete cases n = 1105, 417 obs censored [3]c

 

Variables

Coeff

S.E.

Coeff

S.E.

Coeff

S.E.

Episode Characteristics

Age in 2003

0.000

0.001

0.000

0.001

0.000

0.001

Gender

0.046

0.022*

0.051

0.018**

0.054

0.024*

Lives alone

0.020

0.020

0.015

0.017

0.029

0.023

Barthel score at admission

0.017

0.003**

0.017

0.002**

0.016

0.003**

EQ5D score at admission

−0.495

0.033**

−0.479

0.026**

−0.484

0.037**

Descriptors of IC Service

Acute Admission Avoidance Service

−0.038

0.027

−0.017

0.021

0.156

0.042**

Duration of Service Provision

0.000

0.000

0.001

0.000*

0.000

0.000

Descriptors of IC-related Services

Referral – Primary

−0.031

0.052

−0.044

0.043

−0.020

0.058

Referral – Hospital

−0.098

0.051

−0.053

0.042

0.020

0.059

Referral – Other

−0.003

0.078

0.059

0.065

0.013

0.086

Referral – Social Workers (Reference Group)

      

Alternative to IC – Other

−0.063

0.031*

−0.077

0.025**

−0.077

0.030*

Alternative to IC – Home

−0.045

0.023*

−0.028

0.019

−0.046

0.022*

Alternative to IC – Hospital (Reference Group)

      

Interactions

Gender*Type of IC

−0.048

0.053

−0.027

0.037

−0.057

0.053

Barthel score at admission*Type of IC

0.003

0.004

−0.002

0.003

0.004

0.004

EQ5D score at admission *Type of IC

−0.098

0.083

0.061

0.057

−0.118

0.082

Acute Admission Avoidance Service*Type of IC

0.110

0.064

0.039

0.039

0.086

0.063

Alternative to IC – Other *Type of IC

0.137

0.084

0.133

0.059*

0.140

0.082

Alternative to IC – Home*Type of IC

0.086

0.106

−0.027

0.049

0.070

0.104

Alternative to IC – Hospital *Type of IC (Reference Group)

      

_constant

0.157

0.101

0.093

0.084

0.100

0.105

N

 

688

1,105

  

688

Censored obs

     

417

R-Squared

 

0.284

0.266

  

0.634

Rho

     

0.950

  1. * 5% level of significance, ** 1% level of significance;
  2. Dependent variable: change in EQ-5D, IC = Intermediate care
  3. aMethod 1 assumes that missing data are MCAR; bMethod 2 assumes that missing data are MAR; cMethod 3 assumes that missing data are MNAR.