Table 2.

Summary table of the immediate effect of sediment addition on respiration data: two way ANOVA, response variable: respiration rate (square root transformed), the dependent variables: Before/After treatment (fixed factor) and sediment treatment (fixed factor) and an interaction, and the ANCOVA, response variable: respiration rate after treatment application (square root transformed), the dependent variables respiration rates before treatment application (covariate) and sediment treatment (fixed factor).

Statistical test	Dependent variable	d.f.	F	p
Two way ANOVA	Before/After	1, 36	26.910	<0.001
	Sediment treatment	3, 36	5.314	0.004
	Before/After*Sediment treatment	3, 36	4.470	0.009
ANCOVA	Before treatment respiration	1, 35	3.623	0.065
	Sediment treatment	3, 35	9.621	<0.001