condition mean min max ZT0-3 0.7613801902499999 0.535400227 0.9873601535 ZT4-7 3.2642854882499996 2.534673082 3.9938978945 ZT8-11 4.873235554 4.1105825945 5.635888513499999 ZT12-15 9.26256603675 8.2591124945 10.266019579 ZT16-19 10.534719287 9.560187104 11.509251469999999 ZT20-23 18.704099635 16.35705681 21.05114246