condition mean min max ZT0-3 2.2950749999999998 2.13368 2.45647 ZT4-7 1.7340200000000001 1.7340200000000001 1.7340200000000001 ZT8-11 0.4142125 0.4142125 0.4142125 ZT12-15 0 0 0 ZT16-19 0.4739565 0.4739565 0.4739565 ZT20-23 1.1550825 1.1550825 1.1550825