condition mean min max ZT0-3 5.270367637750001 5.145812895 5.394922380500001 ZT4-7 9.311425924 7.995990738 10.62686111 ZT8-11 12.91610586325 10.6100499165 15.22216181 ZT12-15 18.895905835 17.775666295 20.016145375 ZT16-19 15.467271474999999 14.166329885 16.768213064999998 ZT20-23 17.9496953875 16.85863924 19.040751535