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(A) Average daily heart rates (HRs) for the three age groups ± SD, control vs propranolol at 6 months (0–3: ±15.1, 4–10: ±14.1, 11–18: ±9.0). (B) Average daily HRs for the three age groups ± SD, control vs propranolol at 12 months (0–3: ±14.7, 4–10: ±14.3, 11–18: ±11.4).
