condition mean min max ZT0-3 21.632350000000002 21.632350000000002 21.632350000000002 ZT4-7 20.0741 20.0741 20.0741 ZT8-11 14.5968 14.5968 14.5968 ZT12-15 14.39335 14.39335 14.39335 ZT16-19 16.213250000000002 16.213250000000002 16.213250000000002 ZT20-23 19.39965 19.39965 19.39965