condition mean min max ZT0-3 444.699223 444.699223 444.699223 ZT4-7 505.0734105 505.0734105 505.0734105 ZT8-11 544.607229 544.607229 544.607229 ZT12-15 468.87665200000004 468.87665200000004 468.87665200000004 ZT16-19 347.691111 347.691111 347.691111 ZT20-23 324.9547895 324.9547895 324.9547895