condition mean min max ZT0-3 38.62025 27.2134 45.85475 ZT4-7 28.1049 28.1049 28.1049 ZT8-11 21.59685 21.59685 21.59685 ZT12-15 35.43775 23.928849999999997 46.946650000000005 ZT16-19 42.21575 42.21575 42.21575 ZT20-23 43.785799999999995 43.785799999999995 43.785799999999995