_jk mainstage survey and COVID-19 survey responses-timing
I am conducting a study where using GHQ-12 variable as my outcome variable. I am using the mainstage survey (_jk - Waves 10/11) for pre-pandemic period and six COVID-19 surveys (April, May, June, July, September and November) for during pandemic period. However, I have allocated nineteen individuals who appear to have responded in Wave 10 or 11 questions in April and May 2020 and this means that they might have responded for pre-pandemic period after they responded for the during pandemic period. Looking at the surveystart and surveyend variables it seems that there are cases where respondents from Wave 10/11 actually responded after they have responded to COVID-19 surveys. Could you please let me know if indeed there are cases and individuals who are in the state I described above?
On a rather different mode, there is a variable called "scac" with the description self-completion accepted and I am quite unsure what this variable refers for. I noticed that individuals who appear as inapplicable in the scac variable they also have valid data on the scghq1_dv variable. Is this possible?