condition mean min max ZT0-3 14.801711666666668 9.794235 19.79645 ZT4-7 12.0456 12.0456 12.0456 ZT8-11 13.51535 13.51535 13.51535 ZT12-15 22.549075000000002 22.3593 22.73885 ZT16-19 22.105449999999998 22.105449999999998 22.105449999999998 ZT20-23 20.6851 20.6851 20.6851