condition mean min max ZT0-3 1.31554 1.31554 1.31554 ZT4-7 1.4212900000000002 1.4212900000000002 1.4212900000000002 ZT8-11 1.539285 1.539285 1.539285 ZT12-15 1.94108 1.94108 1.94108 ZT16-19 1.426385 1.426385 1.426385 ZT20-23 1.349005 1.349005 1.349005