condition mean min max ZT0-3 19.77789 9.683969999999999 28.156100000000002 ZT4-7 9.277315 9.277315 9.277315 ZT8-11 8.964195 8.964195 8.964195 ZT12-15 24.049349999999997 23.349899999999998 24.7488 ZT16-19 20.8964 20.8964 20.8964 ZT20-23 34.05015 34.05015 34.05015