From:  Heart rate variability as an objective biomarker for work-related musculoskeletal disorder risk: a cross-sectional study of Hong Kong (China) professionals

 Simple slopes: effect of heart rate variability (HRV) coherence on pain intensity at different levels of daily seated hours.

Daily seated hoursSlope (β)tpInterpretation
Low (< 6 hours/day)–0.14–1.420.159Non-significant
Moderate (6–8 hours/day)–0.26–2.880.005Significant
High (> 8 hours/day)–0.41–4.63< 0.001Strongly significant