condition mean min max ZT0-3 0.5423850833333334 0.11329275 1.022824 ZT4-7 0.6142755 0.6142755 0.6142755 ZT8-11 2.3898200000000003 2.3898200000000003 2.3898200000000003 ZT12-15 2.4485407500000003 0.7147765 4.182305 ZT16-19 2.154955 2.154955 2.154955 ZT20-23 1.5941049999999999 1.5941049999999999 1.5941049999999999