Psychosocial, Environmental, and Functional Capacity Determinants of Psychological Workload in Retail Workers: A Multidomain Assessment Using a Digital Tool

Retail service workers face complex occupational demands across psychosocial, environmental, and physical domains; however, integrated multidomain assessments of psychological workload remain limited. A cross-sectional study was conducted among 253 full-time retail workers using the Find My Stress Progressive Web Application (PWA)—a field-deployable digital screening tool. The PWA assessed subjective workload (Subjective Workload Index; SWI), psychosocial factors (workplace bullying, postural difficulty), environmental discomfort (thermal conditions, air quality, noise), musculoskeletal symptoms, and bilateral handgrip strength. Spearman correlations and multiple regression identified significant predictors. Postural difficulty (β = 0.21, p = .003), workplace bullying (β = 0.17, p = .008), thermal discomfort (β = 0.16, p = .021), air quality concerns (β = 0.14, p = .043), task duration (β = −0.16, p = .010), and grip strength (suppressor effect; β = 0.13, p = .030) independently predicted SWI (Adjusted R² = .22, F(6, 214) = 11.45, p < .001). The PWA demonstrated excellent reliability (Cronbach’s α = 0.97) and high usability (87% positive ratings; n = 359). A multidomain digital assessment successfully identified interacting psychosocial, environmental, and functional determinants of psychological workload. The Find My Stress PWA offers a scalable, low-burden platform for occupational stress screening applicable in workplace health surveillance.