condition mean min max ZT0-3 0.771475 0.771475 0.771475 ZT4-7 0.90401 0.90401 0.90401 ZT8-11 1.713365 1.713365 1.713365 ZT12-15 0.894525 0.894525 0.894525 ZT16-19 0.79316 0.79316 0.79316 ZT20-23 1.9521549999999999 1.9521549999999999 1.9521549999999999