. 2019 Apr 18;19:113. doi: 10.1186/s12877-019-1114-2

Table 1.

Participation in HUNT2 (1995–1997) and HUNT3 (2006–2008) Survey

HUNT2	Invited	Participated in HUNT2
HUNT2	N	N	%
Total^a	93,898	65,237	69.5
Age^b
50-59	13,831^b	11,205	81.2
60-69	10,655	9089	85.6
70–79	10,510	8310	79.9
80–89	5413	3202	66.0
90 +	906	387	52.9
HUNT3	Invited	Participated in HUNT3
HUNT3	N	N	%
Total^a	93,860	50,807	54.1
Age^a
50-59	17,313	11,409	65.9
60–69	13,801	9811	71.1
70–79	8594	5744	66.8
80–89	5496	2287	41.6
90 +	890	153	17.2
Age at participation in HUNT2	Could have participated^c in HUNT3	Participated in both HUNT2 and HUNT3
Age at participation in HUNT2	N	N	%
Total^a	65,237	37,071	56.8
Age^a
50-59	11,060	8195	74.1
60–69	9049	5049	55.8
70–79	7994	1800	22.5
80–89	2621	84	3.2
90 +	162	0	0

^aReference: Krokstad et al. [49]

^bReference: Holmen et al. [48]

^cCould have participated: Includes those who participated in HUNT3, those who did not participate in HUNT3, those who were not invited (deceased, emigrated or disappeared), or moved out of the county