
 Term          Contrast Estimate Std. Error     z Pr(>|z|)    2.5 %   97.5 %
  cyl mean(6) - mean(4)   -5.968     1.6393 -3.64   <0.001  -9.1806 -2.75473
  cyl mean(8) - mean(4)   -8.521     2.3261 -3.66   <0.001 -13.0799 -3.96183
  hp  mean(dY/dX)         -0.024     0.0154 -1.56    0.119  -0.0542  0.00616

Columns: term, contrast, estimate, std.error, statistic, p.value, conf.low, conf.high 

