What is the average head size of a 12 year old?

What is the average head size of a 12 year old? Considering changes of the averaged head circumference from 51.5 cm in 8-years-old children to 53.2 cm in 12-years-old children [36] , we estimated the measurement inconsistency across participants was in the range of 0.09 cm (i.e., [(53.2-51.5)/53.2] × 3 cm; 3cm is the S-D separation).

Considering changes of the averaged head circumference from 51.5 cm in 8-years-old children to 53.2 cm in 12-years-old children [36] , we estimated the measurement inconsistency across participants was in the range of 0.09 cm (i.e., [(53.2-51.5)/53.2] × 3 cm; 3cm is the S-D separation).