condition mean min max ZT0-3 17.67975 16.717399999999998 18.6421 ZT4-7 36.21955 36.21955 36.21955 ZT8-11 43.094350000000006 43.094350000000006 43.094350000000006 ZT12-15 0 0 0 ZT16-19 24.2575 24.2575 24.2575 ZT20-23 31.5332 31.5332 31.5332