condition mean min max ZT0-3 398.01275 383.54 412.4855 ZT4-7 350.5455 350.5455 350.5455 ZT8-11 295.03499999999997 295.03499999999997 295.03499999999997 ZT12-15 0 0 0 ZT16-19 180.559 180.559 180.559 ZT20-23 289.2305 289.2305 289.2305