I don't recommend SPSS but rather R. Attached are notes that contain examples and code. R intro here.

http://sgpwe.izt.uam.mx/files/users/uami/gma/R_for_dummies.pdf

David Eugene Boothe@

but i need to use SPSS as im familiar with its use

1- please can you tell me how to include patients in that analysis ( what i mean if i included age as a predictor for example , i had to include all patients or only patients older than 50 years and how he determine the point of more than 50 y as a predictor in that table )

Sorry but i choose software by how well it does what i want it to do. Best wishes, D Booth

You code those aged 50 as independents or predictors, code them 1 and 2 for example, as you would do with gender.

Thanks beatrice

That is exactly what i wanted to know

But why they choose the point of more than 50 years ( how this point is chosen in regression)

Because im doing a similar analysis

Last question: number of people had age less than 50 y e.g. is 7 from 100 payients , is that enough for doing regression analysis ?

if i coded age less than 50 years as 0

and age more than 50 y as 1

is that variable (after coding) is considered continuous variable or categorical variable during performing binary logistic regression?

1. Go to Analyze on SPSS, then click regression and then Binary Logistic.

2. Choose your categorial dependent variable = ( 50 years recoded as 0 and 1) and move it in the dependent box.

Click on your predictors: ...…...and move them into the box named Covariates

See that method has ENTER

and so on

Yes I think your n is OK.