condition mean min max ZT0-3 12.2838868425 11.255377 13.312396685 ZT4-7 14.53371225 14.112210130000001 14.95521437 ZT8-11 16.90783079166667 15.220938083333333 18.5947235 ZT12-15 15.86297335 14.828128640000001 16.89781806 ZT16-19 23.338591363333332 21.190747733333332 25.486434993333333 ZT20-23 22.221252575 20.99739146 23.44511369