condition mean min max ZT0-3 14.025696538999998 11.838090998 16.21330208 ZT4-7 8.976817595 8.902923438 9.050711752 ZT8-11 9.305013674666668 8.963577304000001 9.646450045333333 ZT12-15 11.246756249166667 10.469875028333334 12.02363747 ZT16-19 14.605474936666667 13.907700380000001 15.303249493333333 ZT20-23 14.3315820185 12.900872367 15.76229167