condition mean min max ZT0-3 11.8666 11.8666 11.8666 ZT4-7 12.287949999999999 12.287949999999999 12.287949999999999 ZT8-11 8.16474 8.16474 8.16474 ZT12-15 7.301775 7.301775 7.301775 ZT16-19 10.982016666666667 10.982016666666667 10.982016666666667 ZT20-23 11.7349 11.7349 11.7349