condition mean min max ZT0-3 4.2900275 4.16553 4.414524999999999 ZT4-7 5.932115 5.932115 5.932115 ZT8-11 7.07345 7.07345 7.07345 ZT12-15 0 0 0 ZT16-19 5.37449 5.37449 5.37449 ZT20-23 4.547035 4.547035 4.547035