condition mean min max ZT0-3 2.9425958333333333 1.6547775 4.15222 ZT4-7 0.805694 0.805694 0.805694 ZT8-11 1.29305 1.29305 1.29305 ZT12-15 1.7167755000000002 0.9335910000000001 2.49996 ZT16-19 2.32897 2.32897 2.32897 ZT20-23 3.559955 3.559955 3.559955