condition mean min max ZT0-3 16.64824 16.64824 16.64824 ZT4-7 17.525316 17.525316 17.525316 ZT8-11 14.8048755 14.8048755 14.8048755 ZT12-15 14.962988 14.962988 14.962988 ZT16-19 12.531955 12.531955 12.531955 ZT20-23 18.1350625 18.1350625 18.1350625