system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Normal QRS duration at 1 year of age is
assistant
The correct answer is  Normal QRS duration at various age groups Age group QRS duration in seconds 0-6 months 0.03-0.07 (0.05) 1-5 yr 0.04-0.08 (0.06) 10-15 yr 0.04-0.09 (0.07) >15 yr 0.06-0.09 (0.08) Reference: Essential Paediatrics; O.P. Ghai; Page no: 459