condition mean min max ZT0-3 12.532275 12.396550000000001 12.668 ZT4-7 7.764805 7.764805 7.764805 ZT8-11 11.88025 11.88025 11.88025 ZT12-15 0 0 0 ZT16-19 14.8048 14.8048 14.8048 ZT20-23 13.68435 13.68435 13.68435