condition mean min max ZT0-3 896.735733 896.735733 896.735733 ZT4-7 1225.96294 1225.96294 1225.96294 ZT8-11 935.214191 935.214191 935.214191 ZT12-15 1157.2349095 1157.2349095 1157.2349095 ZT16-19 809.36821 809.36821 809.36821 ZT20-23 866.7402135 866.7402135 866.7402135