condition mean min max ZT0-3 2.45931 2.45931 2.45931 ZT4-7 1.7134800000000001 1.7134800000000001 1.7134800000000001 ZT8-11 1.3841 1.3841 1.3841 ZT12-15 1.5310415 1.5310415 1.5310415 ZT16-19 1.863925 1.863925 1.863925 ZT20-23 3.1489599999999998 3.1489599999999998 3.1489599999999998