condition mean min max ZT0-3 13.679400000000001 12.62635 14.73245 ZT4-7 8.775845 8.775845 8.775845 ZT8-11 7.351565 7.351565 7.351565 ZT12-15 0 0 0 ZT16-19 10.684764999999999 10.684764999999999 10.684764999999999 ZT20-23 10.32452 10.32452 10.32452