condition mean min max ZT0-3 19.8975 19.8975 19.8975 ZT4-7 19.172150000000002 19.172150000000002 19.172150000000002 ZT8-11 16.22885 16.22885 16.22885 ZT12-15 18.8688 18.8688 18.8688 ZT16-19 20.4687 20.4687 20.4687 ZT20-23 20.449849999999998 20.449849999999998 20.449849999999998