condition mean min max ZT0-3 43.392691 43.392691 43.392691 ZT4-7 53.9145685 53.9145685 53.9145685 ZT8-11 47.9390485 47.9390485 47.9390485 ZT12-15 37.9735885 37.9735885 37.9735885 ZT16-19 41.969393999999994 41.969393999999994 41.969393999999994 ZT20-23 41.566674 41.566674 41.566674