condition mean min max ZT0-3 23.190524999999997 22.271949999999997 24.109099999999998 ZT4-7 17.7586 17.7586 17.7586 ZT8-11 68.13505 68.13505 68.13505 ZT12-15 0 0 0 ZT16-19 69.59085 69.59085 69.59085 ZT20-23 37.51885 37.51885 37.51885