condition mean min max ZT0-3 605.495937 605.495937 605.495937 ZT4-7 528.545106 528.545106 528.545106 ZT8-11 578.019458 578.019458 578.019458 ZT12-15 503.0688945 503.0688945 503.0688945 ZT16-19 768.7628569999999 768.7628569999999 768.7628569999999 ZT20-23 787.378013 787.378013 787.378013