condition mean min max ZT0-3 1.8944763840000003 0.269031795 3.5199209730000005 ZT4-7 4.1462562499999995 3.290385718 5.0021267819999995 ZT8-11 10.02122225275 6.077778157 13.9646663485 ZT12-15 10.7906908585 8.357803432 13.223578285 ZT16-19 4.9559140675 4.8458961060000005 5.065932029 ZT20-23 2.22596825725 1.8275380935 2.624398421