condition mean min max ZT0-3 1867.609 1867.609 1867.609 ZT4-7 2545.6459999999997 2545.6459999999997 2545.6459999999997 ZT8-11 1162.9355 1162.9355 1162.9355 ZT12-15 366.4101 366.4101 366.4101 ZT16-19 380.7041 380.7041 380.7041 ZT20-23 490.76076666666665 490.76076666666665 490.76076666666665