condition mean min max ZT0-3 1.89595800225 1.875789265 1.9161267395000001 ZT4-7 1.59040678 1.3925118314999998 1.7883017285 ZT8-11 2.12991512125 2.108428503 2.1514017395 ZT12-15 2.355670892 2.145857277 2.565484507 ZT16-19 2.4029567504999996 2.0143379384999998 2.7915755625 ZT20-23 4.3367840145 3.6664071524999997 5.0071608765