Table 1. Nicotine contents of tea samples obtained from tea-producing areas in Asia.

Tea Samples					Nicotine content (μg g−1 dry weight)
Type	Subtype	Country or district		Number	Average	±	S.D.	Minimum	Median	Maximum
Green tea	Sencha	Japan		31	0.019	±	0.006	0.013	0.017	0.040
	Pan-fired	Taiwan		1	0.011
	Sub total			32	0.019	±	0.006	0.011	0.017	0.040
Black tea		India	Assam	11	0.331	±	0.069	0.246	0.332	0.449
			Darjeeling	64	0.273	±	0.151	0.100	0.219	0.694
		China		1	0.289
		Taiwan		1	0.121
		Indonesia		1	0.101
		Vietnam		1	0.024
	Sub total			79	0.274	±	0.145*	0.024	0.245	0.694
Oolong tea		Taiwan		1	0.020
Total				112	0.199	±	0.169	0.011	0.189	0.694

* Significant difference between green tea and black tea (t-test, P < 0.01).