condition mean min max ZT0-3 1643.770518 1643.770518 1643.770518 ZT4-7 1676.0776815 1676.0776815 1676.0776815 ZT8-11 1560.647861 1560.647861 1560.647861 ZT12-15 1764.222391 1764.222391 1764.222391 ZT16-19 1620.8424224999999 1620.8424224999999 1620.8424224999999 ZT20-23 1241.657416 1241.657416 1241.657416