condition mean min max ZT0-3 14.597150000000001 13.408000000000001 15.7863 ZT4-7 15.24005 15.24005 15.24005 ZT8-11 11.57615 11.57615 11.57615 ZT12-15 0 0 0 ZT16-19 18.85165 18.85165 18.85165 ZT20-23 13.8019 13.8019 13.8019