condition mean min max ZT0-3 2.1368375 2.03449 2.239185 ZT4-7 4.182315 4.182315 4.182315 ZT8-11 4.387865 4.387865 4.387865 ZT12-15 0 0 0 ZT16-19 3.90611 3.90611 3.90611 ZT20-23 3.0031299999999996 3.0031299999999996 3.0031299999999996