condition mean min max ZT0-3 11.72469 10.024280000000001 13.4251 ZT4-7 12.04555 12.04555 12.04555 ZT8-11 9.69087 9.69087 9.69087 ZT12-15 0 0 0 ZT16-19 12.106850000000001 12.106850000000001 12.106850000000001 ZT20-23 13.292649999999998 13.292649999999998 13.292649999999998