condition mean min max ZT0-3 93.420577 93.420577 93.420577 ZT4-7 127.956635 127.956635 127.956635 ZT8-11 143.44833599999998 143.44833599999998 143.44833599999998 ZT12-15 105.2902985 105.2902985 105.2902985 ZT16-19 152.1438695 152.1438695 152.1438695 ZT20-23 126.6046835 126.6046835 126.6046835