condition mean min max ZT0-3 663.616672 663.616672 663.616672 ZT4-7 757.714758 757.714758 757.714758 ZT8-11 856.7666704999999 856.7666704999999 856.7666704999999 ZT12-15 982.2740679999999 982.2740679999999 982.2740679999999 ZT16-19 1106.4030790000002 1106.4030790000002 1106.4030790000002 ZT20-23 886.2968485 886.2968485 886.2968485