condition mean min max ZT0-3 8.789059 8.789059 8.789059 ZT4-7 9.925714500000002 9.925714500000002 9.925714500000002 ZT8-11 9.168110500000001 9.168110500000001 9.168110500000001 ZT12-15 9.60207 9.60207 9.60207 ZT16-19 9.20669 9.20669 9.20669 ZT20-23 9.7618765 9.7618765 9.7618765