condition mean min max ZT0-3 10.5969425 9.59767 11.596215 ZT4-7 16.4131 16.4131 16.4131 ZT8-11 10.589984999999999 10.589984999999999 10.589984999999999 ZT12-15 0 0 0 ZT16-19 16.1981 16.1981 16.1981 ZT20-23 16.908 16.908 16.908