condition mean min max ZT0-3 7.7326925 6.375859999999999 9.089525 ZT4-7 8.867655 8.867655 8.867655 ZT8-11 23.939 23.939 23.939 ZT12-15 0 0 0 ZT16-19 24.42885 24.42885 24.42885 ZT20-23 15.04525 15.04525 15.04525