condition mean min max ZT0-3 860.855432 860.855432 860.855432 ZT4-7 382.02128949999997 382.02128949999997 382.02128949999997 ZT8-11 641.9304970000001 641.9304970000001 641.9304970000001 ZT12-15 882.227185 882.227185 882.227185 ZT16-19 610.086423 610.086423 610.086423 ZT20-23 232.670156 232.670156 232.670156