condition mean min max ZT0-3 68.254504 68.254504 68.254504 ZT4-7 76.3099435 76.3099435 76.3099435 ZT8-11 80.94985650000001 80.94985650000001 80.94985650000001 ZT12-15 69.1685 69.1685 69.1685 ZT16-19 119.598108 119.598108 119.598108 ZT20-23 103.9997475 103.9997475 103.9997475