condition mean min max ZT0-3 38.600049999999996 36.5645 40.6356 ZT4-7 49.486 49.486 49.486 ZT8-11 47.806650000000005 47.806650000000005 47.806650000000005 ZT12-15 0 0 0 ZT16-19 38.163650000000004 38.163650000000004 38.163650000000004 ZT20-23 36.6513 36.6513 36.6513