condition mean min max ZT0-3 0.9837704999999999 0.798186 1.169355 ZT4-7 0.3371855 0.3371855 0.3371855 ZT8-11 1.2634265 1.2634265 1.2634265 ZT12-15 0 0 0 ZT16-19 1.7962250000000002 1.7962250000000002 1.7962250000000002 ZT20-23 1.59433 1.59433 1.59433