condition mean min max ZT0-3 1.5053305 0.941316 2.0693449999999998 ZT4-7 2.37871 2.37871 2.37871 ZT8-11 3.0512550000000003 3.0512550000000003 3.0512550000000003 ZT12-15 0 0 0 ZT16-19 5.0026600000000006 5.0026600000000006 5.0026600000000006 ZT20-23 3.49883 3.49883 3.49883