condition mean min max ZT0-3 243.725227 243.725227 243.725227 ZT4-7 305.4566515 305.4566515 305.4566515 ZT8-11 291.5578185 291.5578185 291.5578185 ZT12-15 285.1880665 285.1880665 285.1880665 ZT16-19 358.2921665 358.2921665 358.2921665 ZT20-23 293.474542 293.474542 293.474542