condition mean min max ZT0-3 15.338844102 10.691548204 19.98614 ZT4-7 9.120328509499998 8.6808084835 9.559848535499999 ZT8-11 8.79517954225 8.7110099345 8.87934915 ZT12-15 9.66343728875 8.1128675375 11.21400704 ZT16-19 17.8664835325 14.678105745 21.05486132 ZT20-23 24.58098087 23.814937225 25.347024515