condition mean min max ZT0-3 3.739725 2.631855 4.847595 ZT4-7 2.19362 2.19362 2.19362 ZT8-11 1.9902199999999999 1.9902199999999999 1.9902199999999999 ZT12-15 0 0 0 ZT16-19 1.57507 1.57507 1.57507 ZT20-23 2.200845 2.200845 2.200845