condition mean min max ZT0-3 22.589399999999998 18.7893 26.389499999999998 ZT4-7 9.609675 9.609675 9.609675 ZT8-11 6.651365 6.651365 6.651365 ZT12-15 0 0 0 ZT16-19 11.555705 11.555705 11.555705 ZT20-23 19.37545 19.37545 19.37545