condition mean min max ZT0-3 5.6388625 3.03064 8.247085 ZT4-7 5.59386 5.59386 5.59386 ZT8-11 3.891805 3.891805 3.891805 ZT12-15 0 0 0 ZT16-19 8.414935 8.414935 8.414935 ZT20-23 9.44347 9.44347 9.44347