condition mean min max ZT0-3 14.2860707235 11.871355067 16.70078638 ZT4-7 4.05207903075 3.905263081 4.1988949804999995 ZT8-11 6.1321347685 4.8480706885 7.4161988485000006 ZT12-15 8.76110727825 7.7072683264999995 9.81494623 ZT16-19 9.129130211 8.0440752305 10.2141851915 ZT20-23 16.763164185 14.972196069999999 18.5541323