condition mean min max ZT0-3 4.549623333333334 4.549623333333334 4.549623333333334 ZT4-7 4.54143 4.54143 4.54143 ZT8-11 2.9585850000000002 2.9585850000000002 2.9585850000000002 ZT12-15 2.633475 2.633475 2.633475 ZT16-19 3.36983 3.36983 3.36983 ZT20-23 4.84409 4.84409 4.84409