condition mean min max ZT0-3 25.23095 25.23095 25.23095 ZT4-7 18.63355 18.63355 18.63355 ZT8-11 17.3893 17.3893 17.3893 ZT12-15 13.3658 13.3658 13.3658 ZT16-19 16.9574 16.9574 16.9574 ZT20-23 20.63165 20.63165 20.63165