condition mean min max ZT0-3 0.867934941 0.7660932140000001 0.969776668 ZT4-7 1.4598427035000001 1.111213842 1.808471565 ZT8-11 2.3096851637499998 2.1497693845 2.4696009429999997 ZT12-15 2.2108690597500003 2.047053403 2.3746847165 ZT16-19 3.42255658025 3.003036811 3.8420763495 ZT20-23 3.47202461875 2.929146733 4.0149025045