condition mean min max ZT0-3 1.03414937975 0.229582421 1.8387163385 ZT4-7 5.58553192075 3.9746010075 7.196462834 ZT8-11 11.625635079 8.864786158000001 14.386484 ZT12-15 19.4785268125 19.12321555 19.833838075 ZT16-19 13.0901943125 12.362676625 13.817712 ZT20-23 8.31061683475 6.651430288 9.9698033815