_id origin   destination   distance   origin_activity   destination_activity   origin_study   destination_study   permanent_location   income   age_range   sex   autonomous_community   trip   distance_order   date_observed   trips_number   trips_km   colspacer
origin destination distance origin_activity destination_activity origin_study destination_study permanent_location income age_range sex autonomous_community trip distance_order date_observed trips_number trips_km