condition mean min max ZT0-3 59.133968 59.133968 59.133968 ZT4-7 76.879065 76.879065 76.879065 ZT8-11 62.128739 62.128739 62.128739 ZT12-15 46.877859 46.877859 46.877859 ZT16-19 54.3025485 54.3025485 54.3025485 ZT20-23 58.5845175 58.5845175 58.5845175