condition mean min max ZT0-3 79.694609 79.694609 79.694609 ZT4-7 58.1427255 58.1427255 58.1427255 ZT8-11 61.0488565 61.0488565 61.0488565 ZT12-15 72.0262765 72.0262765 72.0262765 ZT16-19 79.8309165 79.8309165 79.8309165 ZT20-23 62.58463449999999 62.58463449999999 62.58463449999999