condition mean min max ZT0-3 30.15308333333333 27.014049999999997 33.58235 ZT4-7 26.44995 26.44995 26.44995 ZT8-11 20.5044 20.5044 20.5044 ZT12-15 35.94415 31.271150000000002 40.61715 ZT16-19 30.7594 30.7594 30.7594 ZT20-23 32.8562 32.8562 32.8562