condition mean min max ZT0-3 25.278086 25.278086 25.278086 ZT4-7 49.850395 49.850395 49.850395 ZT8-11 55.195906 55.195906 55.195906 ZT12-15 49.056619 49.056619 49.056619 ZT16-19 34.9370395 34.9370395 34.9370395 ZT20-23 25.520996500000003 25.520996500000003 25.520996500000003