condition mean min max ZT0-3 22.14453333333333 20.908549999999998 23.28125 ZT4-7 17.41885 17.41885 17.41885 ZT8-11 10.00675 10.00675 10.00675 ZT12-15 16.885575000000003 15.768450000000001 18.0027 ZT16-19 15.848700000000001 15.848700000000001 15.848700000000001 ZT20-23 20.73695 20.73695 20.73695