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Table 4 Comparison of results from three methods of regression analysis (Change in Barthel)

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

−0.010

0.009

−0.009

0.007

−0.011

0.009

Gender

−0.007

0.208

0.097

0.164

0.037

0.218

Lives alone

0.225

0.190

0.181

0.150

0.320

0.202

Barthel score at admission

−0.318

0.028**

−0.325

0.022**

−0.305

0.030**

EQ5D score at admission

−0.343

0.312

−0.428

0.239

−0.216

0.328

Descriptors of IC Service

Acute Admission Avoidance Service

0.103

0.218

0.060

0.167

0.728

0.337*

Duration of Service Provision

0.008

0.003*

0.011

0.003**

0.006

0.003*

Descriptors of IC-related Services

Transfer before IC end

4.084

2.452

0.559

0.607

2.713

2.348

Completed Episode

7.438

2.440**

3.443

0.587**

4.926

2.478*

Other IC Outcome

6.640

2.477**

2.921

0.656**

4.727

2.432

Patient died (Reference group)

      

Alternative to IC – Other

−1.130

0.291**

−1.076

0.221**

−1.267

0.291**

Alternative to IC – Home

−0.709

0.223**

−0.667

0.169**

−0.669

0.219**

Alternative to IC – Hospital (Reference Group)

      

Interactions

Barthel score at admission*Type of IC

−0.071

0.050

−0.035

0.027

−0.072

0.051

Acute Admission Avoidance Service* Type of IC

0.592

0.575

0.131

0.354

0.599

0.589

Duration of Service Provision*Type of IC

−0.006

0.008

0.001

0.006

−0.006

0.008

Transfer before IC end*Type of IC

−0.299

0.979

−0.160

0.411

−0.300

0.962

Completed Episode*Type of IC

1.053

0.830

0.374

0.424

1.055

0.816

Other IC Outcome*Type of IC

0.189

2.000

0.072

0.889

0.200

1.980

Patient died*Type of IC (Reference group)

      

Alternative to IC – Other *Type of IC

0.796

0.793

0.968

0.543

0.795

0.778

Alternative to IC – Home*Type of IC

2.261

1.025*

0.124

0.447

2.261

1.006*

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

      

_constant

0.046

2.536

3.888

0.843

2.687

2.592

N

 

713

1,105

  

713

Censored obs

     

392

R-Squared

 

0.278

   

0.634

Rho

     

0.950

  1. *5% level of significance, **1% level of significance;
  2. Dependent variable: change in Barthel, 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.