Understanding Society User Support

Hello,

I am conducting some research using the material deprivation items included in the UKHLS. In particular, I am looking to create binary variables for each of the items where “1” indicates enforced lack (i.e. cannot afford) and “0” for all others. However, I am not sure exactly what the 4th response category (“does not apply”) means. Would these respondents be considered not deprived? Or should they be excluded from the analysis? Any help or advice on where I could find information to clarify this would be greatly appreciated. Thank you!