Table 3.

Effects of the average year of isolation and the difference of the isolation years on growth inhibition (i.e. interference, studied on agar plates) and competition (interaction studied in liquid medium) in pairs of Flavobacterium columnare isolates, collected during disease epidemics in 2003–2010.

parameter	estimate	s.e.	d.f.	t	sig.
inhibition
average year of isolation	0.0034	0.002		2.078	0.039
difference in years of isolation	−0.0001	0.002		0.764	0.446
interaction indexa
average year of isolation	−0.0255	0.009	104.707	−2.759	0.007
difference in years of isolation	0.0024	0.007	103.641	0.355	0.724

^aStrain combination: 0.0215, s.e.: 0.0036, Wald Z: 5.911, p < 0.001, residual: 0.008, s.e.: 0.001, Wald Z: 6.959, p < 0.001.