condition mean min max ZT0-3 125.021185 125.021185 125.021185 ZT4-7 281.4134355 281.4134355 281.4134355 ZT8-11 351.37467200000003 351.37467200000003 351.37467200000003 ZT12-15 254.1026115 254.1026115 254.1026115 ZT16-19 222.4959945 222.4959945 222.4959945 ZT20-23 148.978814 148.978814 148.978814