condition mean min max ZT0-3 18485.058886666666 18485.058886666666 18485.058886666666 ZT4-7 18424.219999999998 18424.219999999998 18424.219999999998 ZT8-11 15713.819443333334 15713.819443333334 15713.819443333334 ZT12-15 12708.28 12708.28 12708.28 ZT16-19 12622.25778 12622.25778 12622.25778 ZT20-23 17826.28889 17826.28889 17826.28889