condition mean min max ZT0-3 12.0651125 9.435975 14.69425 ZT4-7 15.281400000000001 15.281400000000001 15.281400000000001 ZT8-11 4.42622 4.42622 4.42622 ZT12-15 0 0 0 ZT16-19 9.536999999999999 9.536999999999999 9.536999999999999 ZT20-23 21.1918 21.1918 21.1918