condition mean min max ZT0-3 271.046267 271.046267 271.046267 ZT4-7 313.4615005 313.4615005 313.4615005 ZT8-11 299.0578585 299.0578585 299.0578585 ZT12-15 345.718119 345.718119 345.718119 ZT16-19 363.800349 363.800349 363.800349 ZT20-23 356.028368 356.028368 356.028368