condition mean min max ZT0-3 4.23585 4.155445 4.311515 ZT4-7 3.96941 3.96941 3.96941 ZT8-11 3.186305 3.186305 3.186305 ZT12-15 4.4617474999999995 4.12069 4.802804999999999 ZT16-19 4.80201 4.80201 4.80201 ZT20-23 5.34939 5.34939 5.34939