Table 4: Final stepwise multiple regression models. Models show the effect of the biometric and reproductive variables on the number of dark spots below the lateral line in male and female broodstocks of a naturalized population of rainbow trout from southern Chile. SE = standard error of the estimate, β = regression coefficient, P = p-value with exact p-value indicated in parenthesis.

Parameters/Groups	Model	Coefficients	SE	β	t-value	P
Biometric parameters
Males year 2007	Constant	1.9875	0.2075		9.5779	< 0.001 (0.0000)
	Body weight	-0.0006	0.0002	-0.6496	-3.3088	< 0.01 (0.0048)
Females year 2007	Constant	0.6014	0.4458		1.3492	> 0.05 (0.1868)
	Total length	0.0178	0.0086	0.3434	2.0681	< 0.05 (0.0468)
Reproductive parameters
Females year 2007	Constant	-0.9010	0.8529		-1.0564	> 0.05 (0.2987)
	Egg diameter	0.4461	0.1571	0.4487	2.8400	< 0.01 (0.0078)
Females year 2012	Constant	-3.8494	1.7923		-2.1478	< 0.05 (0.0380)
	Spawning time	0.0186	0.0063	0.4309	2.9821	< 0.01 (0.0049)