condition mean min max ZT0-3 197.469972 197.469972 197.469972 ZT4-7 245.1988475 245.1988475 245.1988475 ZT8-11 314.32045400000004 314.32045400000004 314.32045400000004 ZT12-15 318.792829 318.792829 318.792829 ZT16-19 266.408052 266.408052 266.408052 ZT20-23 301.137368 301.137368 301.137368