condition mean min max ZT0-3 172.507195 11.551085 269.6335 ZT4-7 6.19619 6.19619 6.19619 ZT8-11 0.8417135 0.8417135 0.8417135 ZT12-15 12.6940525 7.922355 17.46575 ZT16-19 33.6349 33.6349 33.6349 ZT20-23 206.36599999999999 206.36599999999999 206.36599999999999