condition mean min max ZT0-3 19.73326 19.73326 19.73326 ZT4-7 16.490966 16.490966 16.490966 ZT8-11 13.41295 13.41295 13.41295 ZT12-15 14.245666 14.245666 14.245666 ZT16-19 12.217309 12.217309 12.217309 ZT20-23 13.103236500000001 13.103236500000001 13.103236500000001