condition mean min max ZT0-3 1.7514088487500001 1.0581175095 2.444700188 ZT4-7 1.058581765 0.824716592 1.2924469379999999 ZT8-11 2.6910988959999997 2.2883623964999997 3.0938353955 ZT12-15 2.4696181635 2.060195963 2.8790403639999997 ZT16-19 3.7303993005000002 3.2281777055 4.2326208955 ZT20-23 4.190067408000001 3.3128148145000003 5.067320001500001