condition mean min max ZT0-3 2347.126566 2347.126566 2347.126566 ZT4-7 3105.1551339999996 3105.1551339999996 3105.1551339999996 ZT8-11 1359.314629 1359.314629 1359.314629 ZT12-15 1163.641738 1163.641738 1163.641738 ZT16-19 492.10004499999997 492.10004499999997 492.10004499999997 ZT20-23 237.3362415 237.3362415 237.3362415