# Longitudinal analysis of step counts in Parkinson’s disease patients: insights from a web-based application and generalized additive model

## TL;DR

This study uses a web app and statistical model to analyze step counts in Parkinson's patients, identifying factors like age, sex, and health status that affect mobility.

## Contribution

The novel contribution is the development of a web-based tool and GAM model to analyze step count data in Parkinson’s disease patients.

## Key findings

- Variables like sex, handedness, and age significantly affect step counts in Parkinson’s patients.
- A web application was developed to visualize and track step count data for personalized treatment planning.
- The study found that the PD status of a father and COVID-19 status also significantly influence step counts.

## Abstract

Parkinson’s disease (PD) is a chronic neurological disorder that affects millions of people worldwide. A common motor symptom associated with PD is gait impairment, leading to reduced step count and mobility.

Monitoring and analyzing step count data can provide valuable insights into the progression of the disease and the effectiveness of various treatments. In our study, the generalized additive model (GAM) was used to identify statistically significant variables for step counts. Additionally, a web application was developed as an interactive visualization tool.

The GAM model shows that the following variables are statistically significant for daily step counts: sex (p = 0.03), handedness (p = 0.015), PD status of father (p = 0.056), COVID-19 status (Yes vs. No, p = 0.008), cohort (PD vs. Healthy, p < 0.0001), the cubic regression spline with three basis functions of age by cohorts (p < 0.0001), and the random effect of individual age trajectories (p = 0.0001).

Based on the PPMI data, we find that sex, handedness, PD status of father, COVID-19 status, cohort, and the smoothing functions of age are all statistically significant for step counts. Additionally, a web application tailored specifically for step count analysis in PD patients was developed. This tool provides a user-friendly interface for patients, caregivers, and healthcare professionals to track and analyze step count data, facilitating personalized treatment plans and enhancing the management of PD.