condition mean min max ZT0-3 179.502603 179.502603 179.502603 ZT4-7 235.700781 235.700781 235.700781 ZT8-11 244.355483 244.355483 244.355483 ZT12-15 267.1341485 267.1341485 267.1341485 ZT16-19 193.54359499999998 193.54359499999998 193.54359499999998 ZT20-23 123.96059 123.96059 123.96059