condition mean min max ZT0-3 0.81042036675 0.456240226 1.1646005074999999 ZT4-7 2.145702672 1.7420978225 2.5493075215000003 ZT8-11 5.3857372537499995 3.7376466964999997 7.033827811 ZT12-15 10.211887173000001 9.867386791 10.556387555 ZT16-19 6.61972786675 6.4996857965 6.739769937 ZT20-23 6.3010831217500005 6.0459998015 6.556166442