condition mean min max ZT0-3 10.437266666666666 6.1725 12.7705 ZT4-7 4.093195 4.093195 4.093195 ZT8-11 2.393015 2.393015 2.393015 ZT12-15 3.467875 2.90447 4.03128 ZT16-19 4.98344 4.98344 4.98344 ZT20-23 11.296 11.296 11.296