condition mean min max ZT0-3 1321.059111 1321.059111 1321.059111 ZT4-7 1033.3607729999999 1033.3607729999999 1033.3607729999999 ZT8-11 849.5649155 849.5649155 849.5649155 ZT12-15 741.7226945 741.7226945 741.7226945 ZT16-19 851.8275675 851.8275675 851.8275675 ZT20-23 1150.8397325 1150.8397325 1150.8397325