condition mean min max ZT0-3 715.734354 715.734354 715.734354 ZT4-7 783.572234 783.572234 783.572234 ZT8-11 928.2363655 928.2363655 928.2363655 ZT12-15 949.222411 949.222411 949.222411 ZT16-19 1202.5048135 1202.5048135 1202.5048135 ZT20-23 1033.9023735 1033.9023735 1033.9023735