condition mean min max ZT0-3 74.7670425675 60.37523083 89.158854305 ZT4-7 67.964737765 67.54582392 68.38365161 ZT8-11 82.41373792 78.26008359000001 86.56739225 ZT12-15 92.14795408166667 91.57434043666667 92.72156772666666 ZT16-19 123.21783113333333 122.02552340000001 124.41013886666666 ZT20-23 121.43037834999998 113.10076116666666 129.75999553333332