condition mean min max ZT0-3 0.462581 0.462581 0.462581 ZT4-7 0.8749665 0.8749665 0.8749665 ZT8-11 1.3605049999999999 1.3605049999999999 1.3605049999999999 ZT12-15 1.514575 1.514575 1.514575 ZT16-19 0.083061 0.083061 0.083061 ZT20-23 0.959182 0.959182 0.959182