condition mean min max ZT0-3 11.81610274725 11.2847548945 12.3474506 ZT4-7 8.22228659425 7.645801879 8.798771309500001 ZT8-11 6.58835711725 6.3814850895 6.795229145 ZT12-15 10.2593420905 7.300807181 13.217877000000001 ZT16-19 20.7010928175 15.414732005 25.98745363 ZT20-23 52.9433799875 42.256891135000004 63.62986884