condition mean min max ZT0-3 288.484932 288.484932 288.484932 ZT4-7 283.317325 283.317325 283.317325 ZT8-11 318.208146 318.208146 318.208146 ZT12-15 393.46288 393.46288 393.46288 ZT16-19 308.90285600000004 308.90285600000004 308.90285600000004 ZT20-23 182.642976 182.642976 182.642976