Table 1. Overview data per region.

Biogeographic region [39]	Country	Region	Private ownership	Forest area (1000 ha)	NFI number	Dates of NFI measurements	mean and standard deviation of interval length (yr)	Nr of forest plots	Nr of trees	Plot radius1 (m)	Diameter threshold1 (cm)
Boreal	Finland	Northern Finland	52%	8185	NFI10/NFI11	2004-2008/ 2009–2013	4.5	3369	23225	angle count method2
Boreal	Finland	Southern Finland	92%	4197	NFI10/NFI11	2004-2008/ 2009–2013	4.9	2914	22502	angle count method2
Boreal	Sweden	Småland	84%	1986	NFI7-8/NFI8-9	2005-2009/ 2010–2014	5.0 (0)	2020	35094	3.5/10	4/10
Continental/Alpine	Germany	Bavaria	69%	2605	NFI2/NFI3	2000-2002/ 2011–2012	10.0 (0.67)	7895	61240	angle count method2	7
Continental/Alpine	Switzerland	Alps	31%	799	NFI2/NFI3	1993-1996/ 2004–2006	11.3 (1.14)	3169	36768	8/12.6	12/36
Continental/Alpine	Switzerland	Jura+Plateau	34%	458	NFI2/NFI3	1993-1996/ 2004–2006	10.3 (0.67)	2034	24235	8/12.6	12/36
Continental/Alpine	Slovenia	Maribor	54%	97	NFI1/NFI2	1992–2002 / 2002–2012	10	8036	108715	8/12.6	10/30
Atlantic	Netherlands	Netherlands	51%	373	NFI5/NFI6	2001-2005/ 2012–2013	9.6 (1.56)	1217	25562	variable (5–20 m)	5
Atlantic	Germany	North Rhine-Westphalia	83%	608	NFI2/NFI3	2000-2002/ 2011–2012	10.2 (0.60)	2287	14383	angle count method2	7
Atlantic	Ireland	Southern and Eastern Ireland	39%	324	NFI1/NFI2	2004-2006/ 2009–2012	6.0 (0.91)	580	11395	3/7/12.62	7/12/20
Atlantic	Spain	Galicia	99%	1396	NFI2/NFI3	1986-1987/ 1997–1998	11.0 (0.02)	3941	75929	5/10/15/25	7.5/12.5/22.5/42.5
Mediterranean	Spain	Catalonia	81%	1541	NFI2/NFI3	1989-1990/ 2000–2001	11.3 (0.68)	8471	138831	5/10/15/25	7.5/12.5/22.5/42.5
Mediterranean	Spain	Castilla y León	47%	2435	NFI2/NFI3	1991-1992/ 2002–2004	11.5 (1.13)	9224	136773	5/10/15/25	7.5/12.5/22.5/42.5
Total				24923			7.2	53796	714652

1 Multiple diameter thresholds indicate a design with plots consisting of concentric circles with their radii and the corresponding thresholds

2 see for details on this method for example [30].