condition mean min max ZT0-3 3.99663 3.9913049999999997 4.001955000000001 ZT4-7 4.268545 4.268545 4.268545 ZT8-11 3.312545 3.312545 3.312545 ZT12-15 0 0 0 ZT16-19 4.689085 4.689085 4.689085 ZT20-23 4.94789 4.94789 4.94789