condition mean min max ZT0-3 0.24530849999999998 0.243691 0.246926 ZT4-7 0.2513745 0.2513745 0.2513745 ZT8-11 0.366116 0.366116 0.366116 ZT12-15 0 0 0 ZT16-19 0.36440150000000004 0.36440150000000004 0.36440150000000004 ZT20-23 0.3654855 0.3654855 0.3654855