condition mean min max ZT0-3 0.7901078333333333 0.37412350000000005 1.5555080000000001 ZT4-7 0.2347215 0.2347215 0.2347215 ZT8-11 0.7885845 0.7885845 0.7885845 ZT12-15 1.01812825 0.9098609999999999 1.1263955 ZT16-19 1.0970815 1.0970815 1.0970815 ZT20-23 1.693305 1.693305 1.693305