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User engagement levels measured by the number of completed challenges in the first 30 days of using the <30 Days health risk assessment app (n=52,431).
| Engagement level (challenges completed) | n (%) |
| Very low (0) | 14,546 (27.74) |
| Low (1–14) | 29,991 (57.20) |
| Moderate (15–21) | 2635 (5.03) |
| High (≥22) | 5259 (10.03) |
