condition mean min max ZT0-3 1.8102800000000001 1.8102800000000001 1.8102800000000001 ZT4-7 1.72436 1.72436 1.72436 ZT8-11 1.74285 1.74285 1.74285 ZT12-15 1.8377000000000001 1.8377000000000001 1.8377000000000001 ZT16-19 2.506623333333333 2.506623333333333 2.506623333333333 ZT20-23 1.86844 1.86844 1.86844