condition mean min max ZT0-3 28.861725 25.67085 32.0526 ZT4-7 17.74305 17.74305 17.74305 ZT8-11 20.2991 20.2991 20.2991 ZT12-15 0 0 0 ZT16-19 25.76545 25.76545 25.76545 ZT20-23 28.33625 28.33625 28.33625