condition mean min max ZT0-3 1.6471325 1.366995 1.92727 ZT4-7 1.0773315 1.0773315 1.0773315 ZT8-11 1.5749405 1.5749405 1.5749405 ZT12-15 0 0 0 ZT16-19 1.8238349999999999 1.8238349999999999 1.8238349999999999 ZT20-23 0.6766085 0.6766085 0.6766085