condition mean min max ZT0-3 10.42925 10.42925 10.42925 ZT4-7 6.266325 6.266325 6.266325 ZT8-11 5.769635 5.769635 5.769635 ZT12-15 8.03884 8.03884 8.03884 ZT16-19 10.53095 10.53095 10.53095 ZT20-23 11.436050000000002 11.436050000000002 11.436050000000002