condition mean min max ZT0-3 12.806975000000001 10.57615 15.0378 ZT4-7 13.309899999999999 13.309899999999999 13.309899999999999 ZT8-11 22.58285 22.58285 22.58285 ZT12-15 0 0 0 ZT16-19 18.94975 18.94975 18.94975 ZT20-23 10.335835 10.335835 10.335835