Table 4

Multiple linear regression models of the influence of diabetes mellitus and a second chronic medical condition (i.e. hypertension, heart disease or musculoskeletal illnesses) adjusted for ethnicity, age, gender and years of education on SF-36 and SF-6D scores.

Co-existing chronic medical conditions among subjects with diabetes

No co-existing chronic medical conditions
(n = 115)
 Hypertension
(n = 115)
 Heart disease (n = 46)
 Musculoskeletal illnesses†
(n = 107)
Physical Functioning



Differences in scale scores due to



     Diabetes mellitus
 -2.9*
 -2.4
 -3.5*
 -2.8*
     2nd chronic medical condition‡
 na
 -2.3*
 -7.9**
 -3.7***
     Interaction termξ
 na
 ns
 12.46**
 ns
Role-Physical



Differences in scale scores due to



     Diabetes mellitus
 -3.7
 -3.1
 -5.2*
 -3.6
     2nd chronic medical condition‡
 na
 -2.8
 -12.5**
 -3.1**
     Interaction termξ
 na
 ns
 20.1**
 ns
Bodily Pain



Differences in scale scores due to



     Diabetes mellitus
 -1.8
 -1.6
 -1.5
 -3.8*
     2nd chronic medical condition‡
 na
 -1.3
 -3.1
 -6.9***
     Interaction termξ
 na
 ns
 ns
 7.0**
General Health



Differences in scale scores due to



     Diabetes mellitus
 -2.3*
 -2.0
 -1.9
 -2.2*
     2nd chronic medical condition
 na
 -1.3
 -3.5*
 -3.9***
     Interaction termξ
 na
 ns
 ns
 ns
Vitality



Differences in scale scores due to



     Diabetes mellitus
 -1.3
 -1.4
 -0.9
 -1.3
     2nd chronic medical condition‡
 na
 0.3
 -3.7*
 -2.9***
     Interaction termξ
 na
 ns
 ns
 ns
Social Functioning



Differences in scale scores due to



     Diabetes mellitus
 -0.1
 -0.2
 -1.3
 -1.9
     2nd chronic medical condition‡
 na
 0.6
 -2.5
 -3.4***
     Interaction termξ
 na
 ns
 10.2*
 5.4*
Role-Emotional



Differences in scale scores due to



     Diabetes mellitus
 0.3
 -2.8
 -0.9
 0.4
     2nd chronic medical condition‡
 na
 -2.7
 -11.8**
 -3.4**
     Interaction termξ
 na
 9.9*
 16.8*
 ns
Mental Health



Differences in scale scores due to



     Diabetes mellitus
 -0.2
 -1.7
 -0.1
 -0.1
     2nd chronic medical condition‡
 na
 -0.5
 -0.9
 -2.6***
     Interaction termξ
 na
 5.1*
 ns
 ns
SF-6D



Differences in scale scores due to



     Diabetes mellitus
 -0.03**
 -0.02*
 -0.02*
 -0.02**
     2nd chronic medical condition‡
 na
 -0.03***
 -0.06***
 -0.08***
     Interaction termξ
 na
 ns
 ns
 ns

†Musculoskeletal illnesses included rheumatism, back pain and other bone or muscle illnesses.

‡Second chronic medical condition refers to the chronic medical condition other than diabetes mellitus listed in the relevant column (e.g. hypertension, heart disease or musculoskeletal illnesses).

ξ Interaction term for diabetes mellitus and second chronic medical condition.

*p < 0.05, **p < 0.01, ***p < 0.001, ns denotes statistically insignificant.

Wee et al. Health and Quality of Life Outcomes 2005 3:2   doi:10.1186/1477-7525-3-2