condition mean min max ZT0-3 41.54395 38.30665 44.385 ZT4-7 30.399900000000002 30.399900000000002 30.399900000000002 ZT8-11 24.4069 24.4069 24.4069 ZT12-15 25.39825 24.62655 26.16995 ZT16-19 25.484650000000002 25.484650000000002 25.484650000000002 ZT20-23 28.002850000000002 28.002850000000002 28.002850000000002