condition mean min max ZT0-3 10.670758 10.670758 10.670758 ZT4-7 11.864593 11.864593 11.864593 ZT8-11 14.0146045 14.0146045 14.0146045 ZT12-15 10.523799 10.523799 10.523799 ZT16-19 10.6726955 10.6726955 10.6726955 ZT20-23 9.231638 9.231638 9.231638