condition mean min max ZT0-3 30.8879 30.8879 30.8879 ZT4-7 22.75825 22.75825 22.75825 ZT8-11 10.1598 10.1598 10.1598 ZT12-15 12.758465000000001 12.758465000000001 12.758465000000001 ZT16-19 55.655699999999996 55.655699999999996 55.655699999999996 ZT20-23 43.7457 43.7457 43.7457