condition mean min max ZT0-3 156.116202 156.116202 156.116202 ZT4-7 168.6390285 168.6390285 168.6390285 ZT8-11 203.36109 203.36109 203.36109 ZT12-15 190.27051849999998 190.27051849999998 190.27051849999998 ZT16-19 124.48430049999999 124.48430049999999 124.48430049999999 ZT20-23 108.919917 108.919917 108.919917