condition mean min max ZT0-3 5.28228537675 2.738531537 7.8260392165 ZT4-7 22.0696220775 17.128868824999998 27.01037533 ZT8-11 26.1634714125 24.769782125 27.5571607 ZT12-15 23.5172593025 20.274243115 26.76027549 ZT16-19 22.7118687675 21.974853935 23.4488836 ZT20-23 29.395938415 28.14040801 30.651468819999998