I try to reconstruct employment histories in wave 1 to analyse implications on health in the later waves. Since employment histories are collected for three quarters of the sample in wave 5, I am using both a_empstat (for the first quarter of the sample) and e_empstat (for the remaining sample). Some employment histories of the second group (which should be present in e_empstat) are missed because some people drop out between wave 1 and 5. Am I correct? If yes, would be better to use only the first quarter of the sample (which is randomly selected)?