condition mean min max ZT0-3 10.882758333333333 5.882425 14.386199999999999 ZT4-7 4.648415 4.648415 4.648415 ZT8-11 4.59907 4.59907 4.59907 ZT12-15 8.0078125 6.520849999999999 9.494775 ZT16-19 9.707295 9.707295 9.707295 ZT20-23 14.1772 14.1772 14.1772