Understanding Society User Support

Hello,

I'm a little confused by the hcondncode38 variable and am hoping you can help me.

I read in the questionnaire Universe that this question, if they have ever been diagnosed with a condition (in this case i am interested in clinical depression), is asked to new entrants. It is coded 0 for 'not mentioned' and 1 for 'yes, mentioned' in the data file. But I'm wondering how can a participant have a response of 1 for Wave 10 and 0 for Wave 11? Or how should I interpret this? Does this mean the participant has reported a diagnosis but because they have not mentioned it in the subsequent wave it is coded as 0 'not mentioned'? In this case shouldn't this be inapplicable?
Is there a variable I can use where it will provide information if a participant has ever reported a diagnosis of depression?

Many thanks in advance.