condition mean min max ZT0-3 5.4735175 5.05034 5.896695 ZT4-7 3.478725 3.478725 3.478725 ZT8-11 3.9398299999999997 3.9398299999999997 3.9398299999999997 ZT12-15 0 0 0 ZT16-19 4.95947 4.95947 4.95947 ZT20-23 5.17797 5.17797 5.17797