condition mean min max ZT0-3 2605.997666 2605.997666 2605.997666 ZT4-7 4470.6129805 4470.6129805 4470.6129805 ZT8-11 3675.4783820000002 3675.4783820000002 3675.4783820000002 ZT12-15 3074.2695350000004 3074.2695350000004 3074.2695350000004 ZT16-19 2240.5640565 2240.5640565 2240.5640565 ZT20-23 1685.4010625 1685.4010625 1685.4010625