Simple change score | Mitrushina & Satz^{28} | – | X_{2}−X_{1} | |

“True change” core | Maassen^{29} | Measurement error Regression to mean | (X_{2}−X_{1})×*r*^{2} | Test reliability |

Standard deviation index | Kneebone *et al*^{30} | – | (X_{2}−X_{1})/μSD_{1} | Control group SD |

Standard error of measurement index | Jacobson *et al*^{31} | Measurement error Regression to mean | (X_{2}−X_{1})/μSEM_{1} | Control group SEM |

Cohen’s d | Benedict & Zgaljardic^{15} | – | (X_{2}−X_{1})/SD_{1} | |

Simple regression | McSweeney *et al*^{14} | Regression to mean | Y = BX+C. Y is then compared with actual post-injury score | Control group baseline mean Control group follow up mean |

Multiple regression | Temkin *et al*^{26} | Regression to mean | Y = BX+C+ƒAge+ƒEducation+.... Y is then compared with actual post-injury score | Control group baseline mean |

Variables such as age, education, socioeconomic, and history of concussion | Control group follow up mean |

| Variables such as age, education, socioeconomic status, history of concussion |

RCI | Jacobson & Traux^{32} | Measurement error | (X_{2}−X_{1})/SE_{diff} | Test reliability |

Regression to mean* | Control group SD |

Modified RCI 1 | Chelune *et al*^{33} | Measurement error | (X_{2}−X_{1})−(μ_{2}−μ_{1})/SE_{diff} | Control group baseline mean |

Regression to mean* | Control group follow up mean |

Practice effects | Test reliability |

| Control group SD |

Modified RCI 2 | Zegers & Hafkenschield^{23} | Measurement error | ((X_{2}−X_{1})r)+((μ_{2}−μ_{1})1−*r*)/(√μr√(1−μ*r*)SD) | Control group baseline mean |

Regression to mean* | Control group follow up mean |

Practice effects | Test reliability |

| Control group SD |