Eight standardized severity items mapped to OSDI sections, logged in 30 seconds a day. Composite score charted longitudinally against the mild / moderate / severe bands used in clinic.
OSDI bands: 0–12 normal · 13–22 mild · 23–32 moderate · 33+ severe. The dotted lines indicate the moderate (23) and severe (33) thresholds.
Pearson r ≈ 0.62. Moderate positive correlation between screen time and reported OSDI severity.