condition mean min max ZT0-3 1.789065 1.33371 2.24442 ZT4-7 3.342225 3.342225 3.342225 ZT8-11 13.3081 13.3081 13.3081 ZT12-15 0 0 0 ZT16-19 9.71019 9.71019 9.71019 ZT20-23 5.305235 5.305235 5.305235