Table 3.

Regression coefficients (regr.coef) (describing trend), R-squared value (R-sq) (describing proportion of variance in the dependent variable that is accounted for by the independent variable) and statistical significance of the trend (^nsP > 0.05; ^*P < 0.05, ^**P < 0.01, ^***P < 0.001) of the percentage of screened (i.e., with hip scores) sires and dams of dogs born per year regressed on year of birth.

	Sires			Dams
	Regr. coef.	R-sq	Significance	Regr. coef.	R-sq	Significance
LR	1.2112	0.6681	***	1.1757	0.5622	***
GR	1.6714	0.5758	***	1.7251	0.5640	***
GSD	1.0319	0.6223	***	1.3277	0.7053	***
ROTT	0.9913	0.4951	***	1.1779	0.5504	***
BMD	0.1472	0.0038	ns	0.2715	0.0110	ns
NEWF	0.7430	0.1616	*	1.1514	0.2433	**

Negative regression coefficients indicate at declining trend, and positive an increasing trend, and magnitude of ±1.00 implies a trend of increase/decrease of 1% in the proportion of that category per progressive year of birth.