Table 1 Descriptive Statistical Summary of DDT Component Concentrations in Agricultural Soils across Mainland China (ng/g, soil).

	Percentiles					Mean	Min	Max	SD^a	CV(%)^b	DF(%)^c
	5^th	25^th	50^th	75^th	95^th	Mean	Min	Max	SD^a	CV(%)^b	DF(%)^c
o,p’-DDE	0.008	0.020	0.035	0.066	0.469	0.137	BDL^d	5.57	0.539	392	99.2
p,p’-DDE	BDL^d	0.118	0.428	1.355	17.1	3.29	0.008	72.8	9.98	303	100
o,p’-DDD	0.005	0.015	0.039	0.105	0.853	0.242	BDL^d	4.68	0.730	301	98.4
p,p’-DDD	0.007	0.019	0.078	0.216	2.73	0.469	BDL^d	12.9	1.45	309	97.5
o,p’-DDT	BDL^d	0.012	0.045	0.187	1.55	0.711	BDL^d	24.0	3.24	456	82.8
p,p’-DDT	0.009	0.048	0.253	0.783	10.7	3.21	BDL^d	115	14.4	447	96.7
∑DDTs^e	0.066	0.313	1.18	2.75	33.5	8.06	0.025	211	27.1	336	100

^aSD: standard deviation.
^bCV: coefficient variation.
^cDF: detection frequency.
^dBDL: below detection level.
^e∑DDTs: sum of o,p’-DDE, p,p’-DDE, o,p’-DDD, p,p’-DDD, o,p’-DDT and p,p’-DDT.

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