condition mean min max ZT0-3 1.2656645 1.2656645 1.2656645 ZT4-7 1.315874 1.315874 1.315874 ZT8-11 0.3215795 0.3215795 0.3215795 ZT12-15 0.956453 0.956453 0.956453 ZT16-19 0.23050900000000002 0.23050900000000002 0.23050900000000002 ZT20-23 0.9697795 0.9697795 0.9697795