condition mean min max ZT0-3 56.131134 56.131134 56.131134 ZT4-7 366.274811 366.274811 366.274811 ZT8-11 190.0049055 190.0049055 190.0049055 ZT12-15 229.41287499999999 229.41287499999999 229.41287499999999 ZT16-19 111.47989000000001 111.47989000000001 111.47989000000001 ZT20-23 77.759479 77.759479 77.759479