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Table 2 Weighted linear regression model results for the trends in dog height and cephalic index of Australian National Kennel Council (ANKC) recognised breed

From: Trends in popularity of some morphological traits of purebred dogs in Australia

Outcome variable Parameter b S.E. 95 % CIa t-value P- value
Maximal Height Intercept 50.62 0.48 (49.68, 51.56) 105.60 <0.001
Year −0.10 0.03 (−0.16, −0.04) −3.34 <0.001
Minimal Height Intercept 44.04 0.43 (43.20, 44.89) 102.33 <0.001
Year −0.07 0.03 (−0.12, −0.01) −2.46 0.014
Cephalic Index Intercept 58.18 0.47 (57.26, 59.11) 123.63 <0.001
Year 0.17 0.03 (0.16, 0.23) 5.83 <0.001
  1. Legend: Weighted linear regression model results with the maximal height, minimal height and cephalic index of the breeds (n = 204) in Australian National Kennel Council (ANKC) as outcome variables, year (1986 – 2013) as the predictor and numbers of registered dogs each breed each year in ANKC as weights over the 28 years
  2. a95 % CI: 95 % confidence interval