condition mean min max ZT0-3 3.028 3.028 3.028 ZT4-7 2.882685 2.882685 2.882685 ZT8-11 4.426679999999999 4.426679999999999 4.426679999999999 ZT12-15 3.339485 3.339485 3.339485 ZT16-19 5.074675 5.074675 5.074675 ZT20-23 2.6735550000000003 2.6735550000000003 2.6735550000000003