... was measured using two instruments, the 15D and the GHQ-12. The 15D instrument measures 15dimensions including mobility, vision, hearing, breath-ing, sleeping, eating, speech, elimination, usual ... 2000 and July 2001. The two-stage stratified cluster sampling designwas planned by Statistics Finland. The sampling framecomprised adults aged 30 years and over living in main-land Finland. ... signing, and a questionnairecontaining self-reports such as the SPAQ, the 15D, the GHQ-12 and the Beck Depression Inventory (BDI) thatinterviewees were asked to fill in and bring along to the health...