condition mean min max ZT0-3 4.4588350575 3.9465407989999997 4.971129316 ZT4-7 5.66640819875 4.723544184 6.6092722135 ZT8-11 9.077943648249999 7.1697498715 10.986137424999999 ZT12-15 8.40377904125 8.2489316125 8.55862647 ZT16-19 9.797480491249999 8.1686483075 11.426312675 ZT20-23 8.25228174275 6.1684713175 10.336092168