Possible Change (in reference to previous table)
If the EPD for WW is 30 and the ACC for WW is 0.4, the true value for WW EPD is probably between 19 and 41 (30 ± 11)
The possible change value in the table represents one standard deviation (SD). Technically, there is a 67% chance that the true value is between 19 and 41. (One SD represents a 67% probability that the true value is in that range.)