condition mean min max ZT0-3 9.04885 9.04885 9.04885 ZT4-7 9.465084999999998 9.465084999999998 9.465084999999998 ZT8-11 8.116285 8.116285 8.116285 ZT12-15 6.093095 6.093095 6.093095 ZT16-19 7.616474999999999 7.616474999999999 7.616474999999999 ZT20-23 7.541125 7.541125 7.541125