condition mean min max ZT0-3 10.655401666666666 8.967055 12.5029 ZT4-7 11.4226 11.4226 11.4226 ZT8-11 10.19765 10.19765 10.19765 ZT12-15 16.767425000000003 15.786100000000001 17.74875 ZT16-19 10.041885 10.041885 10.041885 ZT20-23 12.2246 12.2246 12.2246