condition mean min max ZT0-3 210.414644 210.414644 210.414644 ZT4-7 205.4933855 205.4933855 205.4933855 ZT8-11 159.16941150000002 159.16941150000002 159.16941150000002 ZT12-15 157.9598315 157.9598315 157.9598315 ZT16-19 159.78016300000002 159.78016300000002 159.78016300000002 ZT20-23 185.4307675 185.4307675 185.4307675