condition mean min max ZT0-3 3.8661549710000003 3.455819608 4.276490334 ZT4-7 10.011467564 9.006046333 11.016888795 ZT8-11 18.154204875 15.22637175 21.082038 ZT12-15 22.2311768175 17.816259495 26.64609414 ZT16-19 27.159449072500003 26.604807335 27.714090810000002 ZT20-23 22.842533189999997 22.564068419999998 23.12099796