Table 4.
Group differences among half-lives of radon exhalation from wood species

Wood species		EPAAvg. in chamber(pCi/l)	Half-live(mean± SD)1st, 2nd, 3rd, T-mean	MinMax	F-test	P Value	Group difference
SW	Pinus densiflora Siebold. & Zucc.	0.3	.4304 ± .34825	.001.50	9.211	.000	A,B>B,C
			.3109 ± .22826
			.1913 ± .20202
			.3109 ± .28276
	Larix kaempferi (Lamb.) Carriere.	0.3	.3587 ± .28642	.001.10	0.522	.595	A,B,C
			.3065 ± .20591
			.3283 ± .23913
			.3312 ± .24519
	Chamaecyparis obtusa (Siebold. & Zucc.) Endl.	0.5	.4761 ± .31069	.001.50	0.160	.852	A,B,C
			.4652 ± .34333
			.5022 ± .31019
			.4812 ± .31980
	HW	Quercus accutissima Carruth.	0.6	.6065 ± .34859	.001.70	0.026	.975	A,B,C
				.5957 ± .40985
.5891 ± .35605
.5971 ± .36984
Quercus rubra L.		0.5	.5891 ± .37489	.001.70	3.065	.050	A,B,C
			.5543 ± .41937
			.4152 ± .25470
			.5196 ± .36184