condition mean min max ZT0-3 8.38294 7.86439 9.389634999999998 ZT4-7 6.236545 6.236545 6.236545 ZT8-11 7.201165 7.201165 7.201165 ZT12-15 12.9447 12.7122 13.1772 ZT16-19 9.107415 9.107415 9.107415 ZT20-23 9.942699999999999 9.942699999999999 9.942699999999999