condition mean min max ZT0-3 10.228791666666666 8.2305 12.505949999999999 ZT4-7 12.043225 12.043225 12.043225 ZT8-11 29.097099999999998 29.097099999999998 29.097099999999998 ZT12-15 41.820475 40.86245 42.7785 ZT16-19 33.1528 33.1528 33.1528 ZT20-23 25.14905 25.14905 25.14905