The Company of Biologists

Table 2.

Failure time analysis of the time swum by Atlantic cod, using the Cox proportional hazards model, including all the variables measured

Variables in the model	r²	χ²	d.f.^{^*}	P value
Burst—coast	0.81	55.4	1	<0.0001
LDH activity in white muscle caudal sample	0.04	7.6	1	0.0002
CCO activity in white muscle caudal sample	0.02	4.9	1	0.0217

Variables in the model	r²	χ²	d.f.^{^*}	P value
Burst—coast	0.81	55.4	1	<0.0001
LDH activity in white muscle caudal sample	0.04	7.6	1	0.0002
CCO activity in white muscle caudal sample	0.02	4.9	1	0.0217

Model r²

Model χ²

d.f.

P value

0.87

67.9

<0.0001

LDH, lactate dehydrogenase; CCO, cytochrome c oxidase.

Variables were entered into the model using forward stepwise selection.

Burst—coast indicates the total number of burst—coast movements made by fish during the swim test.

, degrees of freedom.