I am trying to construct an eldercare–focused extract estimating the number of people in that have provided care, but the WT06 weight is really throwing me off.

Is there a post-extract formula to use on aggregate WT06 that will estimate the number of unique individuals who provided elder care in a given year? I do understand it is a time-use survey, but at this time, I am not focusing on the amount of time performing these duties, rather the number of people doing care.

Also, would it be your opinion that these weights are sufficient for state-level representation? I know I could run the replicates to give me the conf. intervals, but was wondering if this is strictly to be used nationally.