condition mean min max ZT0-3 0.3771945 0.3771945 0.3771945 ZT4-7 0.1840255 0.1840255 0.1840255 ZT8-11 0.16496 0.16496 0.16496 ZT12-15 0.29000000000000004 0.29000000000000004 0.29000000000000004 ZT16-19 0.708571 0.708571 0.708571 ZT20-23 0.3046715 0.3046715 0.3046715