Table 1.

Summary of radon in Swedish and Canadian properties as a function of period of construction.

Build period	n (# datapoints)		Geometric mean radon (Bq/m3)		Upper CI95		Lower CI95
	Canada	Sweden	Canada	Sweden	Canada	Sweden	Canada	Sweden
1941–1950	386	1385	76.3	105.7	83.3	111.6	69.8	100.1
1951–1960	1679	2204	86.7	109.0	90.3	113.8	83.3	104.5
1961–1970	1965	4945	97.0	115.6	100.8	118.8	93.2	112.4
1971–1980	3162	10,190	96.3	103.3	99.5	105.3	93.3	101.3
1981–1990	2562	7262	87.8	58.2	90.9	59.7	84.8	56.7
1991–2000	3221	3459	100.0	42.9	102.8	44.4	97.2	41.4
2001–2011	4307	2847	108.1	38.3	110.6	39.9	105.6	36.8
2011–2020	2392	617	131.1	28.4	135.7	30.9	126.6	26.1