condition mean min max ZT0-3 1.9964312705 1.4426931619999999 2.550169379 ZT4-7 1.12465520425 1.030275198 1.2190352105 ZT8-11 1.18797248475 0.824477052 1.5514679175000001 ZT12-15 1.909146486 1.552663812 2.26562916 ZT16-19 2.17315699475 2.135453075 2.2108609144999996 ZT20-23 3.83928366 3.7604536545 3.9181136655