condition mean min max ZT0-3 12.76095 11.485399999999998 14.0365 ZT4-7 11.061499999999999 11.061499999999999 11.061499999999999 ZT8-11 10.046025 10.046025 10.046025 ZT12-15 0 0 0 ZT16-19 9.471795 9.471795 9.471795 ZT20-23 12.0826 12.0826 12.0826