condition mean min max ZT0-3 52.74831666666667 34.63995 62.225300000000004 ZT4-7 25.9569 25.9569 25.9569 ZT8-11 23.14065 23.14065 23.14065 ZT12-15 34.082049999999995 33.69805 34.466049999999996 ZT16-19 37.66265 37.66265 37.66265 ZT20-23 62.8271 62.8271 62.8271