... Social Insurance Institutionof Finland were contacted. Interviewers attended trainingsessions on the specific themes that were to be covered in the computer assisted interviews. During the interviews,the ... was measured using two instruments, the15D and the GHQ-12. The 15D instrument measures 15dimensions including mobility, vision, hearing, breath-ing, sleeping, eating, speech, elimination, usual ... further research aiming at designingoptimal working and living environments in terms oflighting conditions. Current indoor lighting standards arebased on specifications concerning the visual require-ments....