condition mean min max ZT0-3 5.360945 5.0442350000000005 5.677655 ZT4-7 4.50245 4.50245 4.50245 ZT8-11 3.7015450000000003 3.7015450000000003 3.7015450000000003 ZT12-15 0 0 0 ZT16-19 5.50535 5.50535 5.50535 ZT20-23 4.86186 4.86186 4.86186