condition mean min max ZT0-3 3.7081447357500004 3.7025300260000003 3.7137594455 ZT4-7 3.21436706225 2.7848670565 3.643867068 ZT8-11 6.01008036175 4.735885836 7.2842748875000005 ZT12-15 6.974741261249999 6.8155750625 7.13390746 ZT16-19 6.501004706750001 6.136102402500001 6.865907011 ZT20-23 8.759895911000001 7.6502059455 9.8695858765