condition mean min max ZT0-3 2.38221 1.80847 2.95595 ZT4-7 2.615845 2.615845 2.615845 ZT8-11 4.9483250000000005 4.9483250000000005 4.9483250000000005 ZT12-15 0 0 0 ZT16-19 4.2283 4.2283 4.2283 ZT20-23 3.930435 3.930435 3.930435