condition mean min max ZT0-3 0.46600296724999996 0.24506745300000002 0.6869384814999999 ZT4-7 1.40266321475 0.9272989455 1.878027484 ZT8-11 3.23036544275 2.6903898495 3.770341036 ZT12-15 7.499958695749999 4.301496255 10.698421136499999 ZT16-19 3.836195846 3.4525534569999996 4.219838235 ZT20-23 7.2965671745 6.227804988999999 8.36532936