condition mean min max ZT0-3 698.462826 698.462826 698.462826 ZT4-7 713.9106695 713.9106695 713.9106695 ZT8-11 826.288 826.288 826.288 ZT12-15 657.7307745 657.7307745 657.7307745 ZT16-19 768.8984825 768.8984825 768.8984825 ZT20-23 786.9496859999999 786.9496859999999 786.9496859999999