condition mean min max ZT0-3 15.084689455 9.626127775 20.543251135 ZT4-7 27.7719793925 23.898028930000002 31.645929855 ZT8-11 35.1322952175 29.638212615 40.62637782 ZT12-15 43.8349274775 42.887082325 44.782772630000004 ZT16-19 40.486268205 40.30246793 40.67006848 ZT20-23 50.98832408 49.578539109999994 52.39810905