condition mean min max ZT0-3 2196.7 2196.7 2196.7 ZT4-7 2117.4 2117.4 2117.4 ZT8-11 2123.8999999999996 2123.8999999999996 2123.8999999999996 ZT12-15 1942.3000000000002 1942.3000000000002 1942.3000000000002 ZT16-19 2173.35 2173.35 2173.35 ZT20-23 2107.8 2107.8 2107.8