highly significantp < 0.001
Analysis of covariance indicated a highly significant difference in the slope of the trend line from 1985 to 1999 as compared to the trend line from 1999 to 2005 (p < 0.001).
Analysis of covariance indicated a highly significant difference in the slope of the trend line from 1985 to 1999 as compared to the trend line from 1999 to 2005 (p < 0.001).