condition mean min max ZT0-3 12.405142383000001 8.340446326 16.46983844 ZT4-7 12.554411310999999 12.135131577 12.973691045 ZT8-11 11.5751546465 9.4361156245 13.7141936685 ZT12-15 17.1490836675 15.45447854 18.843688795 ZT16-19 19.119770357500002 18.866827415000003 19.3727133 ZT20-23 17.85253923 17.2994063 18.40567216