condition mean min max ZT0-3 4.900408333333333 1.994655 6.492405 ZT4-7 0.0 0.0 0.0 ZT8-11 0.82181 0.82181 0.82181 ZT12-15 2.0998799999999997 1.2052100000000001 2.99455 ZT16-19 1.12047 1.12047 1.12047 ZT20-23 2.78771 2.78771 2.78771