Skip to main content

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.