condition mean min max ZT0-3 7.17461635825 6.5918654965 7.75736722 ZT4-7 3.59020126825 3.3770286545 3.803373882 ZT8-11 3.3961477755 3.0273809105 3.7649146405 ZT12-15 5.24380515825 4.0494818755 6.438128441 ZT16-19 5.7557883135 4.8095765319999995 6.702000095 ZT20-23 10.3453437265 8.466454093 12.22423336