Echtelijke Staat means marital status. You may come across the term in some pre-printed forms, like prison registers or military service records.
Possible answers are:
- Gehuwd (married)
- Ongehuwd (unmarried/single)
- Weduwe (widow)
- Weduwnaar (widower)
- Gescheiden (divorced).

Wedding photo of Jan Marijnissen and Toos Flooren, 1943