condition mean min max ZT0-3 0.3561770345 0.18065502 0.531699049 ZT4-7 1.65450618475 1.364678585 1.9443337845 ZT8-11 2.25422695025 1.9036897415 2.604764159 ZT12-15 5.254919094249999 4.303109982 6.206728206499999 ZT16-19 4.95981355625 4.2247697965 5.694857316 ZT20-23 9.05408139475 7.8219520515 10.286210738000001