condition mean min max ZT0-3 7.74288616425 6.2004388375 9.285333491 ZT4-7 5.11809725175 5.0452604985 5.190934005 ZT8-11 5.776006926000001 5.313318713 6.238695139000001 ZT12-15 3.7277154235000003 3.4935550600000003 3.961875787 ZT16-19 3.4554111164999997 3.381005743 3.52981649 ZT20-23 3.2962683420000003 3.1051836820000003 3.487353002