condition mean min max ZT0-3 0.8638835 0.683813 1.129108 ZT4-7 0.390431 0.390431 0.390431 ZT8-11 0.40401549999999997 0.40401549999999997 0.40401549999999997 ZT12-15 0.46567299999999995 0.42373399999999994 0.507612 ZT16-19 0.5855600000000001 0.5855600000000001 0.5855600000000001 ZT20-23 0.963386 0.963386 0.963386