condition mean min max ZT0-3 281.165155 281.165155 281.165155 ZT4-7 455.144282 455.144282 455.144282 ZT8-11 333.90668700000003 333.90668700000003 333.90668700000003 ZT12-15 439.839092 439.839092 439.839092 ZT16-19 531.331619 531.331619 531.331619 ZT20-23 541.555584 541.555584 541.555584