condition mean min max ZT0-3 80.48978333333334 67.78145 105.13974999999999 ZT4-7 120.6745 120.6745 120.6745 ZT8-11 189.06900000000002 189.06900000000002 189.06900000000002 ZT12-15 190.66525000000001 180.874 200.4565 ZT16-19 139.591 139.591 139.591 ZT20-23 82.6422 82.6422 82.6422