condition mean min max ZT0-3 7.8635025 7.86146 7.865545 ZT4-7 10.3233 10.3233 10.3233 ZT8-11 5.574669999999999 5.574669999999999 5.574669999999999 ZT12-15 0 0 0 ZT16-19 6.980449999999999 6.980449999999999 6.980449999999999 ZT20-23 8.34512 8.34512 8.34512