condition mean min max ZT0-3 901.525591 901.525591 901.525591 ZT4-7 741.8055435 741.8055435 741.8055435 ZT8-11 630.735412 630.735412 630.735412 ZT12-15 755.363402 755.363402 755.363402 ZT16-19 847.9417735 847.9417735 847.9417735 ZT20-23 690.0537635000001 690.0537635000001 690.0537635000001