condition mean min max ZT0-3 18.3863 18.3863 18.3863 ZT4-7 14.8926 14.8926 14.8926 ZT8-11 12.3277 12.3277 12.3277 ZT12-15 13.15995 13.15995 13.15995 ZT16-19 17.8922 17.8922 17.8922 ZT20-23 17.41505 17.41505 17.41505