condition mean min max ZT0-3 12.663350000000001 11.9341 13.392600000000002 ZT4-7 11.02505 11.02505 11.02505 ZT8-11 11.391100000000002 11.391100000000002 11.391100000000002 ZT12-15 0 0 0 ZT16-19 15.3387 15.3387 15.3387 ZT20-23 14.729700000000001 14.729700000000001 14.729700000000001