condition mean min max ZT0-3 2.8805525000000003 2.630675 3.13043 ZT4-7 3.5965949999999998 3.5965949999999998 3.5965949999999998 ZT8-11 4.314295 4.314295 4.314295 ZT12-15 0 0 0 ZT16-19 5.105845 5.105845 5.105845 ZT20-23 4.22787 4.22787 4.22787