Table 1.

Potential factors influencing gait and forensic gait analysis.

Potential factors	Gait	Analysis
Internal	Gender [52–54]; Age [49,52,53,55,56]; Walking speed [27–30,49,57,58]; Injuries / physical limitations / surgeries [55]; Physical and mental disorders [49,55,59]; Emotions [45,49,59,60]; Posture and changes in body weight [49,54–56]; Pregnancy [55,61]; Alcohol/drunkenness [49,55]; Medication [62]; Drugs [63]; Music [49]; Visual information [64]	Type of camera [11]; Viewing angle/camera location [11,12,38,49,55,65–68]; Distance between camera and subject [3,49,57,66]; Frame rate [3,6,11,12,38,57]; Resolution [3,11,12,38,66]; Lens distortion [11,66]; Type of storage equipment [11,38]; Player specifications [11]; Elapsed time [49,55,57,68,69]; Number of observants [70]; Skills/experience of observants [12,38,71]; Interpretation differences [71,72]
External	Walking surface [49,55,65,68,69]; Type of clothing and/or footwear [3,12,49,55,57,65,68,72,73]; Carrying/propelling an object [49,53,55,68,69,73]; Elapsed time [49,55,57,68,69]	Illumination [3,11,12,38,49,55,57,65,67]; Shadow [3,12,49,57]; Reflections [12,57]; Indoor/outdoor environment [55]; Occlusion by individuals/objects [3,11,49]; Background and contrast [3,12,49,57]; Camera blur due to movement [49]; Type of clothing/footwear [3,12,49,55,57,65,68,72,73]