Cohort profile: Norwegian survey of health and ageing (NORSE)

BMC Public Health

Table 2 Previous health examination studies in Oppland during 1970s – 990 s, which can be linked to NORSE

	County	Year	Invited (N)	Participated (%)**	Birth cohort	Age at survey	Age in 2017
Counties Study	Oppland	Wave I: 1976–8	N = 28,068	92%	1925–41	35–49	76–92
Counties Study	Oppland	Wave II: 1981–3	–	91%	1925–41	40–58	76–92
Counties Study	Oppland	Wave III: 1986–8	–	87%	1925–41	45–63	76–92
40-year surveys	Oppland	1991	N = 13,196	73%	1947–51	40–42	66–70
40-year surveys	Oppland	1993–4	N = 7532	73%	1952–54	40–42	63–65
40-year surveys	Oppland	1997–8	N = 7820	68%	1955–57	40–42	60–62

Source: https://www.fhi.no/div/helseundersokelser/landsomfattende-helseundersokelser-lhu/helseundersokelser/fylkesundersokelsene-i-finnmark-sog/
** Estimated from page 66–67 from this report https://www.fhi.no/globalassets/dokumenterfiler/studier/helseundersokelsene/oversikt-over-fylker-og-arskull-40-aringsundersokelser.pdf
Based on numbers in Table 2 (92% of the birth cohort 1925–41, 73% of the 1947–54 cohorts and 68% of the 1955–57 cohorts participated) we estimate that 553 (58%) NORSE participants will have participated in one or more of these previous health examination studies in the former county of Oppland

ISSN: 1471-2458