condition mean min max ZT0-3 0.7220278333333333 0.0 1.6922445 ZT4-7 0.529485 0.529485 0.529485 ZT8-11 1.8768894999999999 1.8768894999999999 1.8768894999999999 ZT12-15 5.49120975 5.437259500000001 5.54516 ZT16-19 4.541565 4.541565 4.541565 ZT20-23 3.51767 3.51767 3.51767