condition mean min max ZT0-3 37.41216666666667 32.83525 40.978300000000004 ZT4-7 44.62365 44.62365 44.62365 ZT8-11 86.02575 86.02575 86.02575 ZT12-15 82.72435 72.87434999999999 92.57435000000001 ZT16-19 64.72115 64.72115 64.72115 ZT20-23 59.50965 59.50965 59.50965