condition mean min max ZT0-3 1135.378444 1135.378444 1135.378444 ZT4-7 1172.828372 1172.828372 1172.828372 ZT8-11 922.881075 922.881075 922.881075 ZT12-15 907.1862040000001 907.1862040000001 907.1862040000001 ZT16-19 901.835727 901.835727 901.835727 ZT20-23 994.796434 994.796434 994.796434