condition mean min max ZT0-3 3.1972125 3.0291550000000003 3.3652699999999998 ZT4-7 3.6548100000000003 3.6548100000000003 3.6548100000000003 ZT8-11 2.580735 2.580735 2.580735 ZT12-15 0 0 0 ZT16-19 4.19755 4.19755 4.19755 ZT20-23 4.04669 4.04669 4.04669