condition mean min max ZT0-3 23.952975 21.760199999999998 26.14575 ZT4-7 28.457500000000003 28.457500000000003 28.457500000000003 ZT8-11 28.769599999999997 28.769599999999997 28.769599999999997 ZT12-15 0 0 0 ZT16-19 22.6383 22.6383 22.6383 ZT20-23 20.990099999999998 20.990099999999998 20.990099999999998