condition mean min max ZT0-3 1.8956917500000001 1.777995 2.0133885 ZT4-7 2.5408 2.5408 2.5408 ZT8-11 1.6322999999999999 1.6322999999999999 1.6322999999999999 ZT12-15 0 0 0 ZT16-19 2.50055 2.50055 2.50055 ZT20-23 1.8167900000000001 1.8167900000000001 1.8167900000000001