condition mean min max ZT0-3 29.03008666666667 11.23291 40.95725 ZT4-7 9.93111 9.93111 9.93111 ZT8-11 10.72155 10.72155 10.72155 ZT12-15 18.06195 15.28475 20.83915 ZT16-19 27.317749999999997 27.317749999999997 27.317749999999997 ZT20-23 50.0256 50.0256 50.0256