condition mean min max ZT0-3 7.2538825 6.550865 7.956899999999999 ZT4-7 4.299175 4.299175 4.299175 ZT8-11 5.1045300000000005 5.1045300000000005 5.1045300000000005 ZT12-15 0 0 0 ZT16-19 6.58633 6.58633 6.58633 ZT20-23 6.532725 6.532725 6.532725