condition mean min max ZT0-3 496.217544 496.217544 496.217544 ZT4-7 316.22015 316.22015 316.22015 ZT8-11 202.1463985 202.1463985 202.1463985 ZT12-15 260.341245 260.341245 260.341245 ZT16-19 216.3229475 216.3229475 216.3229475 ZT20-23 214.284172 214.284172 214.284172