condition mean min max ZT0-3 0.024407333333333336 0.0 0.07322200000000001 ZT4-7 0.06876995 0.06876995 0.06876995 ZT8-11 0.2132465 0.2132465 0.2132465 ZT12-15 0.23911837499999997 0.03857425 0.43966249999999996 ZT16-19 0.3323685 0.3323685 0.3323685 ZT20-23 0.0 0.0 0.0