condition mean min max ZT0-3 44.970666666666666 39.6539 49.44015 ZT4-7 22.700499999999998 22.700499999999998 22.700499999999998 ZT8-11 23.384900000000002 23.384900000000002 23.384900000000002 ZT12-15 28.428024999999998 27.99955 28.856499999999997 ZT16-19 29.585 29.585 29.585 ZT20-23 43.23455 43.23455 43.23455