condition mean min max ZT0-3 3.91482 3.57871 4.25093 ZT4-7 2.957055 2.957055 2.957055 ZT8-11 3.4938000000000002 3.4938000000000002 3.4938000000000002 ZT12-15 0 0 0 ZT16-19 6.02731 6.02731 6.02731 ZT20-23 4.59393 4.59393 4.59393