Distributions and Sources of Sedimentary Sterols as well as Their Indications of Sewage Contamination in the Guanting Reservoir, Beijing

Table 4

Average values of sterols of three groups of sampling points in the Guanting Reservoir based on the cluster analysis (μg g⁻¹).

Sterols	Group	Group	Group	ANOVA analysis
	1	2	3	df	F	value
Cholesterol	2.61	4.64	2.28	18	1.527	0.247
Cholestanol	1.20	1.178	0.79	18	1.573	0.238
Coprostanol	0.72	0.72	0.43	18	1.637	0.226
Epicoprostanol	0.76	0.54	0.40	18	1.185	0.331
Campesterol	0.16	0.13	0.11	18	1.02	0.383
Sitosterol	23.99	9.40	2.49	18	86.86	<0.001
Stigmasterol	8.55	6.68	1.44	18	38.66	<0.001
The total sterol	38.00	23.29	7.95	18	51.49	<0.001

The significance level value is less than 0.05; ANOVA: analysis of variance.