condition mean min max ZT0-3 31.918750000000003 31.918750000000003 31.918750000000003 ZT4-7 25.94045 25.94045 25.94045 ZT8-11 36.819 36.819 36.819 ZT12-15 38.1406 38.1406 38.1406 ZT16-19 36.1439 36.1439 36.1439 ZT20-23 27.2325 27.2325 27.2325