condition mean min max ZT0-3 43.38851666666667 35.358850000000004 48.9821 ZT4-7 28.5406 28.5406 28.5406 ZT8-11 21.8369 21.8369 21.8369 ZT12-15 29.6729 29.11575 30.23005 ZT16-19 32.3671 32.3671 32.3671 ZT20-23 47.7166 47.7166 47.7166