condition mean min max ZT0-3 6.3006825 6.13016 6.471204999999999 ZT4-7 5.396985 5.396985 5.396985 ZT8-11 4.7236650000000004 4.7236650000000004 4.7236650000000004 ZT12-15 0 0 0 ZT16-19 5.94594 5.94594 5.94594 ZT20-23 5.19235 5.19235 5.19235