Pediatrics General b8411ab8 At what age upper segment : lower segment ratio becomes 1 : 1 ? A 3 - 6 years B 5 - 8 years C 7 - 10 years D 10 - 12 years High-Yield Explanation Age US : LS Ratio Birth 1.7 : 1 3 years 1.3 : 1 7 - 10 years 1 : 1 > 10 years 0.3 : 1