condition mean min max ZT0-3 6.0128795555 5.225001808 6.800757302999999 ZT4-7 4.48023387125 3.868702803 5.0917649395 ZT8-11 7.902978652750001 6.4276293745 9.378327931000001 ZT12-15 12.89443235475 9.7976765045 15.991188205 ZT16-19 15.563836420000001 14.335964795 16.791708045 ZT20-23 22.932333677499997 21.624870764999997 24.239796589999997