condition mean min max ZT0-3 26.9635 26.9635 26.9635 ZT4-7 21.01325 21.01325 21.01325 ZT8-11 19.14085 19.14085 19.14085 ZT12-15 23.5897 23.5897 23.5897 ZT16-19 29.030450000000002 29.030450000000002 29.030450000000002 ZT20-23 24.91395 24.91395 24.91395