condition mean min max ZT0-3 0.55183375 0.433493 0.6701745 ZT4-7 1.67747 1.67747 1.67747 ZT8-11 8.825595 8.825595 8.825595 ZT12-15 0 0 0 ZT16-19 2.922905 2.922905 2.922905 ZT20-23 1.470505 1.470505 1.470505