Module 33Multiple Regression ExamplesReviewed 19 July 05 / MODULE 33This module contains several examples of the use of the multiple regression analytical procedure as published in AJPH

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Dependent variable

y = Quality of Well Being score (QWB) at two years

Independent variables

x1: Intervention

x1 = 1 if person was in intervention group

= 0 otherwise

x2:QWB at baseline

x2 = baseline score

x3:Gender

x3 = 1 if person was a male

= 0 otherwise, ie a female

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x4-5: Age

x4 = 1 if age 75-84

= 0 otherwise

x5 = 1 if age 85 +

= 0 otherwise

x6-7: CHQ

x6 = 1 if moderate

= 0 otherwise

x7 = 1 if severe

= 0 otherwise

x8: Physically active

x8 = 1 if 3 times per week

= 0 if < three times per week

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x9: Reduced weight

x9 = 1 if tried to lose weight

= 0 otherwise

x10:Medigap (Other insurance)

x10 = 1 if Medigap insurance

= 0 if otherwise, ie Medicaid

x11:Education

x11 = education level in years

x12:Education x Intervention interaction

x12 = (x11)*(x1)

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