condition mean min max ZT0-3 540.444059 540.444059 540.444059 ZT4-7 587.673861 587.673861 587.673861 ZT8-11 558.5981850000001 558.5981850000001 558.5981850000001 ZT12-15 572.8410085 572.8410085 572.8410085 ZT16-19 665.8010105000001 665.8010105000001 665.8010105000001 ZT20-23 795.888395 795.888395 795.888395