condition mean min max ZT0-3 4.5231 4.5231 4.5231 ZT4-7 4.357865 4.357865 4.357865 ZT8-11 3.55253 3.55253 3.55253 ZT12-15 3.550535 3.550535 3.550535 ZT16-19 3.217085 3.217085 3.217085 ZT20-23 3.0502700000000003 3.0502700000000003 3.0502700000000003