condition mean min max ZT0-3 535.462826 535.462826 535.462826 ZT4-7 226.6103425 226.6103425 226.6103425 ZT8-11 125.78474800000001 125.78474800000001 125.78474800000001 ZT12-15 152.1525855 152.1525855 152.1525855 ZT16-19 646.577245 646.577245 646.577245 ZT20-23 959.7919454999999 959.7919454999999 959.7919454999999