condition mean min max ZT0-3 73.90344999999999 66.2584 81.5485 ZT4-7 51.851200000000006 51.851200000000006 51.851200000000006 ZT8-11 38.29685 38.29685 38.29685 ZT12-15 0 0 0 ZT16-19 76.7634 76.7634 76.7634 ZT20-23 80.645 80.645 80.645