To cite PhysioGaitNorm and the normative gait indices it supports:

  Matsui Y (2026). _PhysioGaitNorm: Normative Gait Reference Database
  for the Physio Ecosystem_. R package version 0.1.0,
  <https://github.com/x-biosignal/PhysioGaitNorm>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {PhysioGaitNorm: Normative Gait Reference Database for the Physio Ecosystem},
    author = {Yusuke Matsui},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://github.com/x-biosignal/PhysioGaitNorm},
  }

  Schwartz M, Rozumalski A (2008). “The Gait Deviation Index: a new
  comprehensive index of gait pathology.” _Gait & Posture_, *28*(3),
  351-357. doi:10.1016/j.gaitpost.2008.05.001
  <https://doi.org/10.1016/j.gaitpost.2008.05.001>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {The Gait Deviation Index: a new comprehensive index of gait pathology},
    author = {Michael H. Schwartz and Adam Rozumalski},
    journal = {Gait & Posture},
    year = {2008},
    volume = {28},
    number = {3},
    pages = {351-357},
    doi = {10.1016/j.gaitpost.2008.05.001},
  }

  Baker R, McGinley J (2009). “The Gait Profile Score and Movement
  Analysis Profile.” _Gait & Posture_, *30*(3), 265-269.
  doi:10.1016/j.gaitpost.2009.05.020
  <https://doi.org/10.1016/j.gaitpost.2009.05.020>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {The Gait Profile Score and Movement Analysis Profile},
    author = {Richard Baker and Jennifer L. McGinley},
    journal = {Gait & Posture},
    year = {2009},
    volume = {30},
    number = {3},
    pages = {265-269},
    doi = {10.1016/j.gaitpost.2009.05.020},
  }