condition mean min max ZT0-3 6.0931049999999995 5.312475 6.873735 ZT4-7 6.5689150000000005 6.5689150000000005 6.5689150000000005 ZT8-11 4.68096 4.68096 4.68096 ZT12-15 0 0 0 ZT16-19 8.41478 8.41478 8.41478 ZT20-23 8.343985 8.343985 8.343985