condition mean min max ZT0-3 567.5728333333334 532.4135 605.3975 ZT4-7 541.3865000000001 541.3865000000001 541.3865000000001 ZT8-11 611.627 611.627 611.627 ZT12-15 710.3215 681.5285 739.1144999999999 ZT16-19 774.804 774.804 774.804 ZT20-23 499.8755 499.8755 499.8755