condition mean min max ZT0-3 30.819200000000002 30.819200000000002 30.819200000000002 ZT4-7 28.60655 28.60655 28.60655 ZT8-11 25.308 25.308 25.308 ZT12-15 23.89435 23.89435 23.89435 ZT16-19 30.66805 30.66805 30.66805 ZT20-23 29.7354 29.7354 29.7354