Table 2. Results for the statistical analysis of long-term stability assessment.

Matrix	NMIJ CRM No.	Target pesticides	b 1	b 0	s	s(b1)	t0.95, n−2×s(b1)
Brown rice	7504-a	Etofenprox	−0.0000001	0.1794	0.0039	0.0000004	0.000001
		Fenitrothion	0.000002	0.1054	0.0047	0.000001	0.000001
Soybean	7509-a	Chlorpyrifos	−0.00017	11.4776	0.2773	0.0002	0.00038
		Diazinon	0.00009	21.7787	0.3350	0.0002	0.00046
		Fenitrothion	0.00019	88.0798	1.6412	0.0009	0.00227
		Permethrin	0.00067	19.9343	0.3199	0.0002	0.00044