condition mean min max ZT0-3 24.5863 22.1577 27.0149 ZT4-7 14.18275 14.18275 14.18275 ZT8-11 11.596 11.596 11.596 ZT12-15 0 0 0 ZT16-19 13.879750000000001 13.879750000000001 13.879750000000001 ZT20-23 18.6661 18.6661 18.6661