condition mean min max ZT0-3 47.67785 45.069649999999996 52.40575 ZT4-7 49.17585 49.17585 49.17585 ZT8-11 52.126599999999996 52.126599999999996 52.126599999999996 ZT12-15 67.094475 64.09565 70.0933 ZT16-19 53.1108 53.1108 53.1108 ZT20-23 57.04565 57.04565 57.04565