condition mean min max ZT0-3 0.803774 0.803774 0.803774 ZT4-7 0.4074875 0.4074875 0.4074875 ZT8-11 0.3314295 0.3314295 0.3314295 ZT12-15 0.5720455 0.5720455 0.5720455 ZT16-19 0.5370895 0.5370895 0.5370895 ZT20-23 0.8833679999999999 0.8833679999999999 0.8833679999999999