condition mean min max ZT0-3 8.594674999999999 8.594674999999999 8.594674999999999 ZT4-7 6.798265 6.798265 6.798265 ZT8-11 1.653135 1.653135 1.653135 ZT12-15 0.961457 0.961457 0.961457 ZT16-19 3.21916 3.21916 3.21916 ZT20-23 7.253145 7.253145 7.253145