condition mean min max ZT0-3 314.894318 314.894318 314.894318 ZT4-7 621.934843 621.934843 621.934843 ZT8-11 836.257591 836.257591 836.257591 ZT12-15 724.1201735 724.1201735 724.1201735 ZT16-19 492.3639655 492.3639655 492.3639655 ZT20-23 402.932827 402.932827 402.932827