condition mean min max ZT0-3 16.2232 16.2232 16.2232 ZT4-7 11.98115 11.98115 11.98115 ZT8-11 16.0747 16.0747 16.0747 ZT12-15 19.36855 19.36855 19.36855 ZT16-19 21.386400000000002 21.386400000000002 21.386400000000002 ZT20-23 17.506999999999998 17.506999999999998 17.506999999999998