condition mean min max ZT0-3 478.629534 478.629534 478.629534 ZT4-7 176.04827849999998 176.04827849999998 176.04827849999998 ZT8-11 430.70611399999996 430.70611399999996 430.70611399999996 ZT12-15 539.7631445 539.7631445 539.7631445 ZT16-19 706.843827 706.843827 706.843827 ZT20-23 385.63413349999996 385.63413349999996 385.63413349999996