condition mean min max ZT0-3 0.611733 0.611733 0.611733 ZT4-7 1.68837 1.68837 1.68837 ZT8-11 0.623476 0.623476 0.623476 ZT12-15 0.2858825 0.2858825 0.2858825 ZT16-19 0.314438 0.314438 0.314438 ZT20-23 0.44940199999999997 0.44940199999999997 0.44940199999999997