condition mean min max ZT0-3 28.303345 28.303345 28.303345 ZT4-7 44.168315500000006 44.168315500000006 44.168315500000006 ZT8-11 38.8239545 38.8239545 38.8239545 ZT12-15 32.0567645 32.0567645 32.0567645 ZT16-19 29.5435395 29.5435395 29.5435395 ZT20-23 23.7100425 23.7100425 23.7100425