condition mean min max ZT0-3 25.2256272375 22.751545765000003 27.69970871 ZT4-7 6.0793181665 4.385899836 7.772736497 ZT8-11 6.51463895825 4.271676954 8.7576009625 ZT12-15 10.17029938675 9.389404173500001 10.9511946 ZT16-19 15.54672626 14.92177622 16.1716763 ZT20-23 25.850276200000003 23.439886845 28.260665555000003