. Author manuscript; available in PMC: 2022 Sep 1.

Published in final edited form as: Clin J Sport Med. 2021 Sep 1;31(5):e221–e228. doi: 10.1097/JSM.0000000000000943

Table 7:

Reliable change equations for parent HBI symptom ratings

Cognitive scale
Post-acute z score = (Post-acute cognitive score − (0.497 + (0.770 × Retrospective pre-injury cognitive score)))/4.694
1 month z score = (1 month cognitive score − (1.925 + (0.634 × Retrospective pre-injury cognitive score)))/5.726
3 month z score = (3 month cognitive score − (1.752 + (0.657 × Retrospective pre-injury cognitive score)))/5.548
Post-injury z score = (Post-injury cognitive score − (1.072 + (0.717 × Retrospective pre-injury cognitive score)))/5.257
Somatic scale
Post-acute z score = (Post-acute somatic score − (0.659 + (0.563 × Retrospective pre-injury somatic score)))/2.394
1 month z score = (1 month somatic score − (0.828 + (0.525 × Retrospective pre-injury somatic score)))/2.864
3 month z score = (3 month somatic score − (0.867 + (0.550 × Retrospective pre-injury somatic score)))/2.959
Post-injury z score = (Post-injury cognitive score − (0.757 + (0.554 × Retrospective pre-injury cognitive score)))/2.703