condition mean min max ZT0-3 69.71551666666667 62.36265 78.32005000000001 ZT4-7 69.0352 69.0352 69.0352 ZT8-11 61.280199999999994 61.280199999999994 61.280199999999994 ZT12-15 46.49485 42.33595 50.65375 ZT16-19 35.17415 35.17415 35.17415 ZT20-23 40.2577 40.2577 40.2577