condition mean min max ZT0-3 63.812825 59.80385 67.8218 ZT4-7 118.38395 118.38395 118.38395 ZT8-11 32.22965 32.22965 32.22965 ZT12-15 0 0 0 ZT16-19 34.255399999999995 34.255399999999995 34.255399999999995 ZT20-23 69.563 69.563 69.563