condition mean min max ZT0-3 34.23695 23.50275 41.016 ZT4-7 27.5689 27.5689 27.5689 ZT8-11 27.1306 27.1306 27.1306 ZT12-15 39.973375 31.7405 48.20625 ZT16-19 45.39965 45.39965 45.39965 ZT20-23 48.659 48.659 48.659