condition mean min max ZT0-3 7.86387493225 6.075463571 9.6522862935 ZT4-7 9.92048136475 8.036404884500001 11.804557845 ZT8-11 12.57228174 12.238735575 12.905827904999999 ZT12-15 10.300925629 9.538993696 11.062857562 ZT16-19 13.1703385485 10.009390322000002 16.331286775 ZT20-23 30.648175605 23.441247765 37.855103445