Waves with Height and weight
I am looking for confirmation on the collection of body mass index in US. I have reviewed the questionnaires and nurses measurement form, and it looks as though self-report height and weight were collected in Wave 1 only, and that measured height and weight were collected in Wave 2 only.
The reason I ask is that I would like to control for change in BMI - have I missed something, or were they not collected? If not, is there a rationale that is available to me that I can use?